Material Terfenol-D Research Articles

A magnetically switchable demultiplexer via Terfenol-D in phononic crystal

This study introduces a novel approach for developing a controllable demultiplexer by applying a magnetic field to Terfenol-D cylinders within a solid–solid phononic crystal structure. Dynamic controllable demultiplexers are essential devices in acoustic and optical communication networks, yet adjustable elastic demultiplexers are notably lacking in current sound systems and acoustic communication technologies. The proposed phononic crystal-based demultiplexer features a square lattice (12 × 19) composed of tungsten cylinders embedded in a poly methyl methacrylate (PMMA) substrate. The switchable design consists of two identical, symmetrical parts separated by an input waveguide. In addition, each unit includes an output channel, a common input channel, and a square ring resonator, with the output channel side-coupled to the input bus waveguide. Moreover, Terfenol-D, a magnetostrictive material, is utilized in the hollow cylinders of the output channels. Switchability of the elastic demultiplexer outputs is achieved by dynamically altering the Young’s modulus of the Terfenol-D cylinders through the application of a magnetic field. This magnetic influence modifies the Young’s modulus of the Terfenol-D material in the output waveguides, enabling controllability. By varying the magnetic field applied to the demultiplexer, we find two distinct values of Young’s modulus within the structure. These two values facilitate the high transmission of two desirable peaks with narrow bandwidth through the output channels, allowing for switchable functionality based on the magnetic field’s position. The proposed demultiplexer demonstrates an average crosstalk value of −25.34 dB, indicating strong performance, along with a high average quality factor (Q) of 1773.5 and low average insertion losses of 0.85 dB in the MHz frequency range. The solid–solid elastic controllable demultiplexer is simulated using the finite element method, showcasing its potential for practical applications.

High sensitivity fiber optic current sensor based on Fabry–Perot interferometer manufactured by femtosecond laser

Abstract A novel fiber optic current sensor was prepared based on femtosecond laser processing technology and magnetostrictive material Terfenol-D. Its principle is to use the linear stretching of Terfenol-D material under the action of current to cause linear shift in the sensor spectrum. Firstly, we fabricated Fabry–Perot interferometer (FPI1) using femtosecond laser in a tapered few mode fiber. Then, FPI2 was prepared using the end face of FPI1, quartz capillary, and single-mode fiber. When cascading FPI1 and FPI2, by adjusting the air-cavity length of FPI2, they form a harmonic vernier effect (HVE) sensor. In HVE sensors, FPI1 forms a cantilever beam inside the capillary, which is not affected by axial strain. Therefore, when the axial strain acts on the HVE sensor, the effective length of axial strain increases to the entire length of the quartz capillary, greatly amplifying the strain sensitivity. Finally, the Terfenol-D rod is pasted onto the HVE strain sensor, and the strain change coupled to the strain sensor caused by magnetic field changes is detected by measuring the wavelength shift of the sensor. As the magnetic field strength is directly proportional to the current in the energized coil, this sensor can measure current. The experiment found that the current sensitivity of the sensor is 5.30 nm A−1 in the range of 0.5 A–3.3 A, and the linear fitting coefficient is 0.9926. Additionally, the minimum measurable current change of the sensor is 23 mA. The current sensor is of advantages of high sensitivity, stable sensing performance, compact structure, easy fabrication and low cost, meaning wide application prospect.

An improvement of the Jiles-Atherton model at various magnetic field amplitudes using the example of Terfenol-D material

Jiles-Atherton (JA) model has been widely used to describe the magnetic hysteresis property of Terfenol-D material. However, the accuracy of the classic JA model is not convincing any more when it is employed to predict the magnetizations under various amplitudes of the applied magnetic fields. This paper measures the magnetic field and magnetization indirectly and approximates the measured results to the best of the classic static JA model. Then it shows that the JA model fails to describe the magnetic hysteresis effectively, especially in computing the hysteresis width. The high computational error is caused from inappropriate value of the pinning parameter to quantify the average energy required to break pinning site. Then the parameter is modified from the constant value to an independent variable on the field amplitude. From the comparisons on the results of the maximum magnetization, maximum magnetization, residual magnetization and coercivity, the performance in describing the hysteresis property of Terfenol-D is obviously promoted by the improved model apparently compared to the classic one.

Measurement and calculation for high frequency magnetic losses of Terfenol-D alloy rod under coupled stress and DC bias fields

Compressive stress, a DC bias magnetic field, and an AC excitation field significantly affect hysteresis characteristics and magnetic energy losses of magnetostrictive materials. Therefore, studying high frequency magnetic losses of magnetostrictive materials under coupling of these three conditions is of great importance for improving the output performance of high power magnetostrictive transducers. In this paper, a magnetic property testing system for magnetostrictive materials has been constructed. It enables the magnetic property testing of Terfenol-D alloy rods under the simultaneous application of stress and DC bias at high frequency excitation (a maximum AC magnetic flux density of 0.5 T at an excitation frequency of 9 kHz). Based on Bertotti separation theory and experimental data, considering the coupling effect of stress and DC bias, a computational model for the high frequency magnetic losses of Terfenol-D materials is proposed. The model incorporates relevant parameters of stress and DC bias to modify loss coefficients, and the expressions for loss coefficients are identified using the symbolic regression method. A comparative analysis between experimental data and model calculation shows good agreement, with the maximum and average errors of 4.68% and 1.74%, respectively.

Temperature-Independent Sensor of the Magnetic Field Based on FBG and Terfenol-D.

Sensors based on Fiber Bragg Grating (FBG) have remarkable benefits like small size, fast response, wide sensing distribution, and immunity to electromagnetic interference, allowing for their widespread application in numerous domains of physical parameter measurement in industrial engineering. In this work, a temperature-independent sensor of the magnetic field based on FBG and the magnetostrictive material Terfenol-D is suggested. By exploiting the distributed sensing characteristic of FBG, a sensing structure that remains unaffected by temperature is designed. The results demonstrate that within the magnetic induction intensity range of 0 mT to 50 mT, the sensitivity of the sensor can reach 7.382 pm/mT, exhibiting good linearity and repeatability. Compared with the control experiment and other sensors of the magnetic field containing Terfenol-D, the sensor has higher sensitivity, better repeatability, and good temperature stability.

An equivalent circuit for magnetoelectric composites operating in a longitudinal mode resonance: BAW-actuated mechanical antenna

It brings new design perspectives to study mechanical antenna in the view of circuit rather than the electromagnetic field. In this paper, an equivalent circuit of bulk acoustic wave (BAW) antenna is constructed by using constitutive relation of magnetoelectric composites and Newton’s governing equation. Based on this circuit, series and parallel resonant frequencies of two phases for BAW antenna are simulated in advanced design system (ADS) and magnetoelectric coupling coefficient is calculated. The results show that the electromechanical coupling coefficient is about 6%, the magnetomechanical coupling coefficient is about 86%, and the magnetoelectric coupling coefficient is about 5.2% under the existing material system (AlN and FeGaB). The magnetoelectric voltage gain is derived based on Kirchhoff’s Current Law, which contributes to studying the influence of the two phases thickness ratio on the performance of BAW antenna. The results show that BAW antenna has the optimal energy coupling and conversion when the thickness ratio of the two phases is 1:1. The input and the output impedances of BAW antenna are calculated by T-parameter matrix, which are perfectly matched with the results in ADS simulation. Relevant experiments have been carried out by preparing the magnetoelectric antenna based on PZT and Terfenol-D materials to verify the universality of the model.

FBG Sensor for Rotation Speed Measurement With Large Sensing Distance Based on Terfenol-D

The rotation speed of revolved mechanisms is one of the critical parameters for characterizing mechanical health conditions, fault diagnosis, and maintenance strategy. This article studies a fiber Bragg grating (FBG) sensor for rotation speed measurement based on Terfenol-D, which generates a rotating magnetic field through a magnet fixed on a rotating structure. Terfenol-D material undergoes magnetostriction with the rotating magnetic field. The FBG sensor fixed on Terfenol-D monitors the rotation speed of the rotating mechanism by inducing the strain of Terfenol-D. The sensor principle is theoretically analyzed in this article, and finite-element simulations are performed on the space magnetic field distribution of the sensor. According to the results, the variation law of the central wavelength of the sensor grating is qualitatively derived. Then, the orthogonal tests are performed with the sensing distance from 2 to 10 cm and the rotation speed from 1 to 50 r/s. The experimental results are compatible with the theoretical analysis. The results show that the sensor can accurately measure the rotation speed at a sensing distance of 10 cm, which makes the sensor have a more flexible installation position. The sensor has good operation performance within experimental conditions.

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

<sec>In the post-Moore era, nanomagnetic logic circuits have shown great potential to replace complementary metal oxide semiconductor (CMOS) circuits. A majority logic gate, as the core of a nanomagnetic logic circuit, is equivalent to the inverter in the CMOS circuit. A nanomagnetic logic majority gate generally has four nanomagnets arranged in a “T” shape. The nanomagnets in the three corners of the “T” (<i>I</i><sub>1</sub>, <i>I</i><sub>2</sub>, <i>I</i><sub>3</sub>) are the three inputs, and the middle nanomagnet is the output (<i>O</i>).</sec><sec>This paper proposes a nanomagnet majority logic gate based on the global strain clock of heterogeneous multiferroic structure, by utilizing the difference in response to the same strain between positive magnetostrictive coefficient material (Terfenol-D) and negative magnetostrictive coefficient material (Ni). From bottom to top, the device is mainly composed of a silicon substrate, a piezoelectric layer, and four elliptical cylindrical nanomagnets. PMN-PT is used as the piezoelectric layer’s material, and three Ni-based nanomagnets (<i>I</i><sub>1</sub>, <i>I</i><sub>2</sub>, and <i>I</i><sub>3</sub>) are utilized as input, while Terfenol-D is used as the material for the output nanomagnet (<i>O)</i>.</sec><sec>Besides, a two-step calculation mode of “high-stress start-low-stress calculation” is designed, that is, the <i>O</i> is first switched to the “Null” with a stress of –30 MPa, and then the stress decreases to –15 MPa, so that the <i>O</i> can realize majority calculation under the coupling of <i>I</i><sub>1</sub>, <i>I</i><sub>2</sub>, and <i>I</i><sub>3</sub>. The micromagnetic simulation software MuMax3 is adopted to simulate the performance of the device. The results reveal that the device can successfully perform continuous majority calculation through any three-terminal input combination. By using the two-step calculation mode, the calculation accuracy of the device can reach 100%, its cycle of continuous calculation is 2.75 ns, and the cycle energy consumption is about 64 aJ. It is found that the change of energy potential well, caused by the change of stress anisotropy energy and dipole coupling energy, is the main reason that determines the magnetization dynamic behavior of the device. Therefore, the results of this paper can provide important guidance for designing nanomagnetic logic circuits.</sec>

Viscoelastic effects on the overall responses of Terfenol-D/polymer composites

When polymers combine with Terfenol-D constituents, the resulting composites inherently exhibit time-dependent and magnetoelastic coupling behaviors. Herein, we present a mathematical framework to simulate the effective viscoelastic behaviors of Terfenol-D/polymer composites via an incremental micromechanics analysis that is based on the homogenization technique for periodic composites in conjunction with a time-integration technique that enables the use of a recursive algorithm for fast and easy solution of the convolution integral constitutive law for linear viscoelastic polymers. The representation of the monolithic Terfenol-D material is based on a recently developed nonlinear constitutive equation. The resulting composite constitutive relation that governs the time-dependent behaviors of composites are first verified by experimental data existing in literatures and then implemented to study the viscoelastic responses of a polymeric matrix with embedded Terfenol-D particles, continuous fibers and layers, respectively. The hysteresis loops in magnetostriction and magnetic flux density responses as well as in ΔE-effect of this composite due to cyclic magnetic loadings together with prestresses and environmental temperatures are shown. We find that even though the Terfenol-D does not show viscoelastic behaviors, an overall time-dependent magnetoelastic coupling responses of this composite still occurs, arising from viscoelastic effects in the polymer.

Size-dependent and nonlinear magneto-mechanical coupling characteristics analysis for extensional vibration of composite multiferroic piezoelectric semiconductor nanoharvester with surface effect

We study the extensional vibration of composite multiferroic piezoelectric semiconductor (PS) nanoharvester driven via a time-harmonic magnetic field. A theoretical analysis about working performances of device is performed based on zero-order plate equations with surface and nonlocal effects, consisting of a nonlinear magneto-mechanical coupling constitutive model for giant magnetostrictive material Terfenol-D and a linear phenomenological theory of PS material ZnO. Numerical results indicate that the basic bahaviors (including resonant frequency, bandwidth characteristic, magneto-electric (ME) coupling effect, output power and energy conversion efficiency) of the nanoharvester, can be dramatically improved through circuit types, semiconduction, external magnetic field, pre-stress and surface effect. This work is essential and crucial for understanding the size-dependent and nonlinear mechanical behaviors of multiferroic PS nanodevices under the extremely complex magnetic field and pre-stress field environments.

Numerical simulation of structure design of magnetoelectric composite ultrasonic levitation device based on multi-physical field coupling

Aiming at the coupling simulation problem that ignores the acoustic structure boundary in the traditional acoustic suspension simulation, based on the magnetostrictive effect, the piezoelectric effect, and the acoustic-structure coupling model, this paper uses a magnetoelectric structure composed of the magnetostrictive material Terfenol-D and the piezoelectric ceramic PZT-5H. The composite material is used as, and the magneto-electric-acoustic fully coupled model of the magneto-electric composite material is established and compared with the one-way coupling model; The particle levitation of magnetoelectric composite materials in the multi-field coupling environment of the magnetic field, electric field, sound field, and displacement field was simulated and calculated; the influence of different widths of magneto-electric composite materials and the size of the resonant cavity on the effect of acoustic levitation was analyzed, and the best results were obtained. The geometric parameters required for optimal suspension are analyzed; the sound pressure output performance of the overall magnetoelectric composite ultrasonic suspension device under the optimal size and the judgment of the suspension position is analyzed, and I displayed the good suspension of the simulated particles in the sound field visually. The research results show that the difference in the amplitude output of the transducer will affect the sound pressure output performance of the transducer, and there is a large error in the one-way coupling; the magnetoelectric composite material can be used as an ultrasonic transducer to achieve acoustic suspension, and suspended particles It shows a good acoustic levitation effect in the simulation. The fully coupled simulation of ultrasonic transducers and the research on such ultrasonic transducers can open new ideas for the research and development of new ultrasonic transducers in the future.

Effect of porosity and gradation of Galfenol-D on vibration suppression of bidirectional functionally graded beam

A differential quadrature technique is used to investigate the vibration control response of bidirectional functionally graded imperfect aluminium-Terfenol-D and aluminium-Galfenol-D. In both transverse and axial orientations, the Terfenol-D and Galfenol-D materials are functionally graded. The bidirectional FG imperfect aluminium-Terfenol-D and aluminium-Galfenol-D governing equation is based on generalised beam theory. With consideration of uniform and uneven porosity distribution, the influence of porosity and an externally applied magnetic field on free vibration suppression behaviour is recorded. In terms of damping performance, Galfenol-D exceeds Terfenol-D. The effect of Lorentz force on the fundamental frequencies is discussed. It's worth noting that the overdamping response of the aluminium-Galfenol-D beam takes less than 0.1 s, but the exponential decay of the aluminium-Terfenol-D beam takes just 0.9 s.

First-principles calculations to investigate electronic, magnetism, elastic properties of TbxDy1-xFe2 (x = 0, 0.25, 0.5, 1)

Electronic, magnetism, elastic properties are studies about TbxDy1-xFe2 (x = 0, 0.25, 0.5, 1), (i.e. four compounds: DyFe2, Tb0.25Dy0.75Fe2, Tb0.5Dy0.5Fe2, TbFe2), which is used the first principle based on density functional theory (DFT). The results have shown that these four compounds have obvious metallicity regarding the calculation of electronics properties. About magnetism, Tb0.25Dy0.75Fe2 is better than other compounds, because its magnetic moment is the largest. Besides, analysis of elastic constants shows that all four compounds have mechanical stability. Further, Tb0.25Dy0.75Fe2 has better ductility than the other three compounds. Based on the excellent magnetism and mechanical properties of Tb0.25Dy0.75Fe2, it is providing candidate materials for the magneto-strictive materials using in the field of magnetic field sensing. Lastly, the concentration of widely used Terfenol-D (Tb0.3Dy0.7Fe2) is near the concentration range of Tb0.25Dy0.75Fe2, so it may be similar properties to Tb0.25Dy0.75Fe2. Therefore, this work is also provided a prediction for the microscopic properties of Terfenol-D (Tb0.3Dy0.7Fe2) materials. And then, it is provided a reference for rare earth magneto-strictive materials, which is currently less studied based on first-principles calculations.

СТВОРЕННЯ ТА ВИКОРИСТАННЯ КОМПОЗИТУ В ЯКОСТІ СИЛОВОЇ КОНСТРУКЦІЇ З ВКЛЮЧЕННЯМ МАГНІТОСТРИКЦІЙНОГО МАТЕРІАЛУ

In our time a new generation of materials - «intellectual» materials - is rapidly developing. Intelligent materials are materials that react in a certain way to changes in the state of the environment or the influence of force fields, vibrations or oscillations and radiations. This reaction results in the modification of material properties, geometry and its adaptation to changes in operating conditions. Constructions are made of intelligent materials, in addition to the traditional functions of taking operational loads and ensuring load and strength, can provide self-monitoring, identification and localization of fatigue injuries. For example, the use of magnetostrictive materials makes it possible to reduce the oscillations or to absorb vibrations and to regulate the stringency. The subject of this work is the analysis of properties that can be obtained on a composite by changing the volumetric part of a magnetostrictive material. The Terfenol-D alloy, which has the most pronounced magnetostrictive properties, was chosen as a magnetostrictive material. The one of the properties of the Terfenol-D alloy is a significant change Young's modulus with change in the magnetic field strength. And also the predicted and experimental results of the change in Young's modulus for pre-loaded samples with compressive forces in a magnetic field were compared. To create a model of a composite material with the Terfenol-D alloy, Material Designer was used - the module of the Ansys system. This module allowed the creation of a composite material for modeling using base materials with known material properties. In the article, the properties of a composite material were obtained using the magnetostrictive material Terfenol-D, and an assessment of the possibility of creating a load-bearing design structure was presented. Material Designer made it possible to create a composite material for modeling using base materials with known material properties. In the article, the properties of a composite material were obtained using the magnetostrictive material Terfenol-D, and an assessment of the possibility of creating a load-bearing structure was presented.

Magnetic field sensing performance of centimeter-scale resonator with optimized structure

Applications of magnetometers are affected mainly by their sensitivities and detection bandwidths. Till now, the applications of the centimeter-scale optomechanical magnetometer have been still limited by those two factors. In order to improve its sensing performance in a low frequency regime of the alternating current (AC) magnetic field sensor based on centimeter-scale whispering gallery mode resonator, we design a new centimeter-scale crystalline whispering gallery mode resonator which has different relative distributions of the magnetostrictive material (Terfenol-D) and the optical material (CaF<sub>2</sub>) from the unoptimized centimeter-scale whispering gallery mode resonator. Experimental results show that this new resonator is able to detect the AC magnetic field ranging from 6 Hz to 1 MHz, and a peak sensitivity of 530 pT·Hz<sup>–1/2</sup> at 123.8 kHz is achieved without DC bias field in a magnetically unshielded non-cryogenic environment. On condition that the optical quality factor is at the same level of 10<sup>8</sup> and there is no DC bias magnetic field, the best sensitivity of the optimized resonator is 11 times higher than that of the unoptimized resonator, and the corresponding detection frequency band is expanded by 1.67 times, switching from the frequency band of 10 Hz–600 kHz to 6 Hz–1 MHz. Besides, the device only needs 100 μW light intensity to operate, which offers us a low optical power consumption magnetometer. Within the detection frequency band, the proposed magnetometer can detect both a single frequency alternating magnetic field signal and an alternating magnetic field signal covering a certain frequency range. It can detect 50 or 60 Hz alternating magnetic field signal generated by current in the wire so that the working status of the power system can be monitored. If the sensing performance is further improved, it may be able to detect the magnetic field signal at frequency in a range of 1 kHz–10 MHz generated by the partial discharge current and the extremely low frequency human body magnetic field signal located in a frequency band of [10 mHz–1 kHz]. Further improvement in sensing performance is possible through optimizing the system noise and the magnetic field response capability of the device, which might allow the device to possess the applications in the fields of power system fault monitoring and medical diagnosis.

Ultrabroadband and sensitive cavity optomechanical magnetometry

Magnetostrictive optomechanical cavities provide a new optical readout approach to room-temperature magnetometry. Here we report ultrasensitive and ultrahigh bandwidth cavity optomechanical magnetometers constructed by embedding a grain of the magnetostrictive material Terfenol-D within a high quality ( Q ) optical microcavity on a silicon chip. By engineering their physical structure, we achieve a peak sensitivity of 26 pT / Hz comparable to the best cryogenic microscale magnetometers, along with a 3 dB bandwidth as high as 11.3 MHz. Two classes of magnetic response are observed, which we postulate arise from the crystallinity of the Terfenol-D. This allows single crystalline and polycrystalline grains to be distinguished at the level of a single particle. Our results may enable applications such as lab-on-chip nuclear magnetic spectroscopy and magnetic navigation.

Model and Experimental Study on Optical Fiber CT Based on Terfenol-D.

A nonlinear hysteresis model of magneto-mechanical-thermo coupling for Terfenol-D materials is presented according to Wiss ferromagnetic theory, thermodynamics relations and Jiles–Atherton model. Numerical calculation and experimental results show that the mode well reflects the magnetostrictive characteristics of Terfenol-D rod under the coupling of stress, temperature and magnetic field. A fiber Bragg grating current transformer based on Terfenol-D material is designed according to the strain sensing mechanism of fiber Bragg grating and the demodulation principle of unbalanced M–Z interferometer. The theoretical analysis and research on the working characteristics of the fiber current transformer under the influence of different prestressing force and bias current are carried out. The results are important for the design and application of the current transformer with the Terfenol-D material.

Electric field control of magnetic susceptibility in laminate magnetostrictive/piezoelectric composites: Phase-field simulation and theoretical model

Electric field control of magnetic susceptibility in laminate magnetostrictive/piezoelectric composites promises to create a new class of magnetoelectric elements, voltage tunable inductors. To elucidate the underlying mechanism of electric field modulated magnetic susceptibility at the domain level, phase-field modeling, and computer simulation are employed to systematically study the laminate magnetoelectric composites of Terfenol-D and PZT, where polycrystalline Terfenol-D can provide a giant magnetoelectric coupling that is important for high-tunability voltage tunable inductors. The simulations focus on the interplay between magnetocrystalline anisotropy and stress-induced anisotropy that is induced by electric field and reveal three regimes of magnetic susceptibility behaviors: constant (regime I), fast-varying (regime II), and reciprocal linear (regime III), where regimes II and III can give rise to a high tunability. Such three regimes are attributed to different magnetization distribution and evolution mechanisms that are modulated by the stress-induced anisotropy. To further characterize the electric field control of magnetic susceptibility behaviors, a general theoretical model of laminate magnetoelectric (ME) composites based on polycrystalline magnetostrictive materials is developed, which reproduces the three regimes of susceptibility behaviors for polycrystalline Terfenol-D material. The general theoretical model for this specific system can also be extended to other laminate polycrystalline ME composites.

Variations of magnetic field measurement with an extrinsic Fabry-Perot interferometer by double-beam technique

The magnetic field variations were measured by a designed optical fiber magnetic field sensor based on the extrinsic Fabry-Perot interferometric sensor with both single and double beam techniques. Behavior of a giant magnetostrictive material Terfenol-D rod was examined at room temperature, under magnetic field variations and varying applied force. In both techniques, as the force increased, the full width half maximum of the peaks decreased; therefore, a larger number of bright and dark fringes occurred with the magnetic field. The displacements increase from 9.24 ± 0.03 to 13.20 ± 0.03 μm for the single beam for 8.65, 9.75, 11.47 and 13.35 N. For the double beam, the displacements are found to be 3.69 ± 0.02, 3.69 ± 0.02, and 4.51 ± 0.02 μm for 8.65, 9.75, and 11.47, respectively. While Terfenol-D is under different forces, the orientations of magnetic domains are investigated. In summary, the magnetic field could be measured precisely at both short and long ranges by these techniques.

Study on the propagation characteristics of SH wave in piemagnetic piezoeletric structures

Propagation of SH wave in layered magnetoelectric structure consisting of piezomagnetic layer and piezoelectric substrate is theoretically investigated in this paper. Since the parameters of the piezomagnetic material change with the variety of the external magnetic field, the piezomagnetic material exhibits nonlinearity. The dispersion characteristics of elastic waves propagation in the magnetoelectric composites is more complex and presents many new physical phenomena under different external magnetic field. The elastic parameter, piezomagnetic parameter and permeability of the piezomagnetic material Terfenol-D varied nonlinearly with external magnetic field. Combining with four different electro-magnetic boundary conditions, the dispersion equations of SH wave satisfying quasi-linear wave equations in the Terfenol-D layer and piezoelectric substrate were derived in matrix form. The results show that the SH wave dispersion curves are influenced by external magnetic fields and geometric configurations. Moreover, the elastic displacement, stress, potential and magnetic potential varied with the external magnetic field are presented graphically. It turns out that no matter how the external magnetic field changes, the displacement, stress and potential satisfy the boundary conditions. The research can provide theoretical reference for the applications of piezomagnetic material Terfenol-D in the nonlinear magnetoelectric sensors and engineering.