Increase In Resonance Frequency Research Articles

A Seawater Conductivity Measurement Method Based on Magnetic Resonance Coupling

This paper proposes a magnetic resonance coupling seawater conductivity measurement method with a dual-coil structure. The passive transceiver coil is composed of two detection coils and capacitive elements placed in seawater. The seawater conductivity measurement is realized by analyzing the relationship between the transmission loss of the resonant magnetic field between the passive transceiver coils in the seawater and the seawater conductivity. In the article, the magnetic resonance coupling measurement method is established and analyzed, the circuit model of the magnetic resonance coupling measurement system transmitted in seawater is established, the experimental device is set up for laboratory testing, and the corresponding test situation is simulated by finite element electromagnetic modelling. The test and simulation results show that the measurement method is feasible; the system has the best performance at the resonant frequency, especially for low-conductivity conditions, and better sensitivity. In addition, the resonant frequency increases, and the conductivity resolution of the measurement system for seawater increases.

Dynamic response of high-power ultrasonic system based on finite element modeling of piezoelectric

In this study, a new finite element model for ultrasonic welding equipment is proposed. This help to solve remaining issues such as element type selection for the numerical model, mesh size, and how to determine the parameters of piezoelectric materials. The obtained results clearly show the influence of element type and mesh size on resonance frequency and amplitude. Specifically, with a mesh size of 2 mm, it was concluded to be suitable for the model. For the C3D8 element (C3D8E), the computation time is reduced by 0.25 times compared to the C3D20R element (C3D20RE). After that, an experimental processing procedure is performed to evaluate the numerical simulation results. Specifically, the handling of signal noise when measuring a very small displacement at high frequencies of an ultrasonic vibrating device. Based on the confirmed finite element model, this model is extended to evaluate the influence of the load on the amplitude and resonant frequency of the ultrasonic welding system. The results show that when the load increases, the amplitude decreases while the resonant frequency increases. The results of this study can be applied to the design of ultrasonic vibration systems.

Piezoelectric Lateral-Extensional Mode Resonators With Reconfigurable Electrode and Resonance Mode-Switching Behavior Enabled by a VO₂ Thin-Film.

This article presents the first two-port lateral-extensional mode zinc oxide (ZnO) piezoelectric resonator with a reconfigurable bottom electrode that is enabled by embedding a vanadium dioxide (VO2) thin film. The insulator-to-metal phase transition of VO2 is triggered by substrate heating that translates to abrupt changes in electric field patterns and piezoelectrically transduced modal vibrations, thus allowing mode-switching of piezoelectric resonators at specific frequencies. Finite element method (FEM) analysis was used to model the broadband frequency response, while frequency characteristics of the corresponding two-port resonator were measured over a temperature range between 20 °C and 95 °C with a specific focus on two resonances at 88 and 148 MHz. By leveraging the hysteretic behavior of VO2 thin film during a heating/cooling cycle, a change in both the capacitive feedthrough and resonance signal levels was observed, due to the abrupt change in the conductivity of VO2 during its phase transition. The unique switch- ON behavior of the resonance at 88 MHz starts at 70 °C during the heating cycle, while the switch- OFF transition begins at 60 °C during the cooling cycle. On the other hand, when the temperature is increased from 20 °C to 60 °C, a decrease in the insertion loss and resonance frequency of 12 dB and 0.28 MHz, respectively, were observed for the resonance at 148 MHz. Meanwhile, a resonance frequency increase of 0.42 MHz was observed during a temperature increase from 60 °C to 95 °C, which can be ascribed to VO2 phase transition from monoclinic to rutile phase. The hysteresis loops for insertion loss and resonance frequency indicate a different critical temperature for phase transition from the monoclinic (insulator) phase and rutile (metallic) phase and vice versa. The substantial variation in the temperature coefficient of frequency can be largely ascribed to electrode reconfiguration enabled by VO2 phase transition.

Dislocation-Induced Energy Dissipation in a Tunable Trilayer Graphene Resonator

In crystalline materials, the creation and modulation of dislocations are often associated with plastic deformation and energy dissipation. Here we report a study on the energy dissipation of a trilayer graphene ribbon resonator. The vibration of the ribbon generates cyclic mechanical loading to the graphene ribbon, during which mechanical energy is dissipated as heat. Measuring the quality factor of the graphene resonator provides a way to evaluate the energy dissipation. The graphene ribbon is integrated with silicon micro actuators, allowing its in-plane tension to be finely tuned. As we gradually increased the tension, we observed, in addition to the well-known resonance frequency increase, a large change in the energy dissipation. We propose that the dominating energy dissipation mechanism shifts over three regions. With small applied tension, the graphene is in elastic region, and the major energy dissipation is through graphene edge folding; as the tension increases, dislocations start to develop in the sample to gradually dominate the energy dissipation; finally, at large enough tension, graphene layers become decoupled and start to slide and cause friction, which induces the more severe energy dissipation. The generation and modulation of dislocations are modeled by molecular dynamics calculation and a method to count the energy loss is proposed and compared to the experiment.

Molecular Dynamics Analysis of Graphene Nanoelectromechanical Resonators Based on Vacancy Defects.

Due to the limitation of graphene processing technology, the prepared graphene inevitably contains various defects. The defects will have a particular influence on the macroscopic characteristics of the graphene. In this paper, the defect-based graphene nanoresonators are studied. In this study, the resonant properties of graphene were investigated via molecular dynamic simulations. The effect of vacancy defects and hole defects at different positions, numbers, and concentrations on the resonance frequency of graphene nanoribbons was studied. The results indicated that single monatomic vacancy has no effect on graphene resonant frequency, and the concentration of the resonant frequency of graphene decreases almost linearly with the increase of single-atom vacancy concentration. When the vacancy concentration is 5%, the resonance frequency is reduced by 12.77% compared to the perfect graphene. Holes on the graphene cause the resonance frequency to decrease. As the circular hole defect is closer to the center of the graphene nanoribbon, not only does its resonant frequency increase, but the tuning range is also expanded accordingly. Under the external force of 10.715 nN, the resonant frequency of graphene reaches 429.57 GHz when the circular hole is located at the center of the graphene nanoribbon, which is 40 GHz lower than that of single vacancy defect graphene. When the circular hole is close to the fixed end of graphene, the resonant frequency is 379.62 GHz, which is 90 GHz lower than that of single vacancy graphene. When the hole defect is at the center of nanoribbon, the frequency tunable range of graphene reaches 120 GHz. The tunable frequency range of graphene is 100.12 GHz when the hole defect is near the fixed ends of the graphene nanoribbon. This work is of great significance for design and performance optimization of graphene-based nanoelectro-mechanical system (NEMS) resonators.

Influences of Parameter Deviation on the Vibration Isolation System of an End Effector

The vibration problem influences the precision of the equipment. However, some vibration isolation systems (VISs) with the perfect theoretical and simulation results are still unable to suppress the vibration well, resulting in the damage during the operation, such as the phenomenon of fragments for the end effector of a glass substrate handling robot. Therefore, this paper focuses on the glass substrate handling robot in actual production and simplifies the VIS into a 2D (2 degree) system. From the analysis of the deviation of material parameters and installation deviations between vibration isolators, this paper concludes that, as long as there is a deviation, the vibration isolation performance of the system will be reduced. Through the mutually verified theory, simulation, and experimental structure, this paper also presents that the resonance frequency increase factor of the vibration isolation system is approximately the deviation. As for the end effector, the distance of the two vibration isolations is 579.4 mm. The change of the load does not change the isolation frequency of the same system, but the resonance amplitude will increase. The results of this study can supervise the installation and selection of vibration isolators in VISs. At the same time, the reasons for the weak vibration isolation performance of some systems are explained.

Analysis and Enhancement of Q-Factor in Thin-Film Bulk Acoustic Wave Resonator (FBAR)

In MEMS technology, MEMS Resonators has shown high potential applications in wireless communications such as Bluetooth and WIFI range. The Bulk Acoustic Wave (BAW) Resonator is a device which has more potential to meet the needs of today’s wireless technology. The Acoustic wave technology has attracted more attention and it’s an effective solution for achieving high-performance RF filters applications due to its low cost and small size of the device. The performance analysis of thin film bulk acoustic resonator (FBAR) by varying different piezoelectric material, piezoelectric material’s thickness and electrode materials is demonstrated in this paper. It is understood that the Quality factor is considerable higher for AlN as compared to ZnO and LiNbO3. Among all the materials, Aluminium electrode achieved maximum quality factor. As the thickness of piezo material decreases, it is found that the resonant frequency and Quality factor increases. Along with the Quality Factor, the top and bottom electrode thickness has a significant impact on the resonant frequency.

Whole-body vibration exposure in unfavourable seated postures: apparent mass and seat-to-head transmissibility measurements in the fore-and-aft, lateral, and vertical directions

Mobile machinery operators are exposed to whole-body vibrations (WBV) and unfavourable postures which may lead to adverse effects on the spine. 14 subjects were exposed to WBV on a rigid seat without a backrest. They adopted nine different postures. Apparent mass and seat-to-head transmissibility were measured in the horizontal (X), lateral (Y) and vertical (Z) directions. They were compared to the reference posture from the ISO 2631-1 standard. Head and thorax inclinations in the sagittal plane had significant effects. An increase in the main resonant frequency together with a decrease in were observed in the Z direction. A second lower frequency peak also appeared ( for X, for Z). increased in the X and Z directions for increased in the X direction. Head and thorax inclinations in the frontal and the horizontal planes had weak or non-significant effects. Practitioner summary: Mobile machinery operators are exposed to whole-body vibration and unfavourable body posture. Laboratory measurements of the apparent mass and the seat-to-head transmissibility in the horizontal (X), lateral (Y) and vertical (Z) directions are presented for 9 postures relevant to the exposure at the driving position and to the effects of vibration on the spine.

Resonant Magnetoelectric Effect at Low Frequencies in Layered Polymeric Cantilevers Containing a Magnetoactive Elastomer

In this work, the resonance enhancement of magnetoelectric (ME) coupling at the two lowest bending resonance frequencies was investigated in layered cantilever structures comprising a magnetoactive elastomer (MAE) slab and a commercially available piezoelectric polymer multilayer. A cantilever was fixed at one end in the horizontal plane and the magnetic field was applied horizontally. Five composite structures, each containing an MAE layer of different thicknesses from 0.85 to 4 mm, were fabricated. The fundamental bending resonance frequency in the absence of a magnetic field varied between roughly 23 and 55 Hz. It decreased with the increasing thickness of the MAE layer, which was explained by a simple theory. The largest ME voltage coefficient of about 7.85 V/A was measured in a sample where the thickness of the MAE layer was ≈2 mm. A significant increase in the bending resonance frequencies in the applied DC magnetic field of 240 kA/m up to 200% was observed. The results were compared with alternative designs for layered multiferroic structures. Directions for future research were also discussed.

Air Damping Analysis of a Micro-Coriolis Mass Flow Sensor.

A micro-Coriolis mass flow sensor is a resonating device that measures small mass flows of fluid. A large vibration amplitude is desired as the Coriolis forces due to mass flow and, accordingly, the signal-to-noise ratio, are directly proportional to the vibration amplitude. Therefore, it is important to maximize the quality factor Q so that a large vibration amplitude can be achieved without requiring high actuation voltages and high power consumption. This paper presents an investigation of the Q factor of different devices in different resonant modes. Q factors were measured both at atmospheric pressure and in vacuum. The measurement results are compared with theoretical predictions. In the atmospheric environment, the Q factor increases when the resonance frequency increases. When reducing the pressure from 1 bar to bar, the Q factor almost doubles. At even lower pressures, the Q factor is inversely proportional to the pressure until intrinsic effects start to dominate, resulting in a maximum Q factor of approximately 7200.

New Insights on Plasmin Long Term Stability and the Mechanism of Its Activity Inhibition Analyzed by Quartz Crystal Microbalance.

We used the research quartz crystal microbalance (RQCM) to monitor regulatory effects of plasmin and trypsin in the presence of their inhibitor α2-antiplasmin. The gold surface of quartz crystals was modified with a β-casein layer that served as a substrate for protease digestion. The addition of plasmin or trypsin as well as their mixtures with α2-antiplasmin resulted in an increase of resonant frequency, f, and in a decrease of motional resistance, Rm, depending on the molar ratio of protease: antiplasmin. At equimolar concentrations of protease and α2-antiplasmin (5 nM:5 nM) full inhibition of protease activity took place. Monitoring of plasmin activity on an hourly and daily basis revealed a prominent effect of autolysis and decrease of plasmin activity in freshly activated samples. The degree of inhibition as well as plasmin half-life (t1/2 = 2.48 ± 0.28 days) connected with its degradation was determined.

Analysis of Harmonic Resonance Characteristics in Grid-Connected LCL Virtual Synchronous Generator

The virtual synchronous generator (VSG), which emulates the essential behavior of the conventional synchronous generator, has attracted great attention. This paper proposes to analyze the harmonic resonance characteristics in VSG using the state-space model. The analysis is based on a full-order state-space small-signal model that fully considers the dynamic of the inner loops and the VSG-based outer power control loop. Participation analysis is used to point out the contributions of different states to the eigenvalues. Moreover, eigenvalue locus and singular value decomposition (SVD) are applied together to evaluate the impact of the inner loop parameters on the harmonic resonance characteristics around the LCL filter resonance frequency. The analysis indicates that the harmonic resonance instability is mainly caused by decreasing the proportional gains of the current loop and the voltage loop. Finally, extensive numerical simulation and experimental results are given to verify the validity of the theoretical analysis. Both the simulation and experimental results indicate that the voltage of the common coupling point is unstable after decreasing the proportional gains of the current and voltage controllers. As Kpc decreases from 5 to 0.4 or Kpv decreases from 0.6 to 0.2, the harmonic distortion factor (HDF) around the LCL filter resonance frequency increases. Furthermore, the consistency of simulation results, experimental results, and the theoretical analysis results is validated.

Persistent sodium conductance contributes to orexin-A-mediated modulation of membrane excitability in neonatal rat mesencephalic V neurons

Orexins are multifunctional hypothalamic neuropeptides that participate in the stimulation of feeding behavior and energy expenditure. However, little is known about their neuromodulatory effects in lower brainstem effector regions, including in the trigeminal neuronal system. The aim of this study was to examine the effects of orexin-A (Ox-A) on the membrane properties of mesencephalic trigeminal (Mes V) neurons that are critically involved in the generation and control of rhythmical oral motor activities. Whole-cell patch clamp recordings were obtained from Mes V neurons in coronal brain slices prepared from Sprague-Dawley rats (postnatal day 12–17). Bath application of Ox-A (100 nM) shortened the duration of the after-hyperpolarization following the action potential, while the interspike frequency of firings during repetitive discharge increased, together with a shift in the frequency-current relationship toward the left. In addition, Ox-A amplified the resonance at the depolarized membrane potential, accompanied with an increase in both Q-value and resonant frequency. A further voltage-clamp experiment demonstrated that Ox-A increased the peak current density of the persistent sodium current (INaP) and shifted its activation curve to the hyperpolarization direction. These results suggested that Ox-A may increase Mes V neuronal excitability by enhancing INaP, possibly sharing a common mechanism with another orexigenic hypothalamic neuropeptide, neuropeptide Y.

Rising Resonance Frequency Is the Sole Sign of Early Middle Ear Disease in Children With Adenoid Hypertrophy.

The present study seeks to estimate the potential of multifrequency tympanometry in the diagnosis of primal otologic disorder in children with adenoid hypertrophy (AH). Prospective observational study. Tertiary pediatric institution. One hundred thirty-one children presenting consecutively at the otolaryngology clinic were divided on the basis of AH into 98 patients and 33 controls. Middle ear status was assessed using pneumatic otoscopy, standard, and wide band tympanometry. Tympanogram type/intratympanic pressure, and resonance frequency (RF) were correlated with each other as well as with a set of clinical parameters. Receiver operating characteristic analysis was employed to reveal the diagnostic value of RF. Mean RF declined in chronic otitis media with effusion by 43.25% (p < 0.001). In our entire cohort, children with AH under the age of 7 years presented with a relative risk = 2.43 of producing "B" tympanogram (p = 0.016) than their older peers. In patients' ears with normal, type "A," tympanogram, RF was the sole tympanometric marker of AH, being elevated by 28.26% in mean value (p = 0.010). On receiver operating characteristic analysis of RF's discriminating capability, the area under the curve was equal to 0.647 (p = 0.010). The optimal cut-off value of RF was set at 899 Hz. AH may induce middle ear stiffening, as RF's increase indicates. Wide band tympanometry output could be a warning sign of ongoing compliance reduction to the sound transmission apparatus, at a time point when physical examination and 226 Hz tympanometry are still unremarkable.

Fabrication and Electromagnetic wave absorption Properties of Co-Cu-substituted Ni-Zn Spinel Ferrite-epoxy Composites

Spinel ferrites (Ni0.5Zn0.5)1-&lt;i&gt;x-y&lt;/i&gt;Co&lt;i&gt;x&lt;/i&gt;Cu&lt;i&gt;y&lt;/i&gt;Fe2O4, (&lt;i&gt;x&lt;/i&gt; = 0 and &lt;i&gt;y&lt;/i&gt; = 0, &lt;i&gt;x&lt;/i&gt; = 0.2 and &lt;i&gt;y&lt;/i&gt; = 0, &lt;i&gt;x&lt;/i&gt; = 0.1 and &lt;i&gt;y&lt;/i&gt; = 0.1, &lt;i&gt;x&lt;/i&gt; = 0 and &lt;i&gt;y&lt;/i&gt; = 0.2) were prepared by sol-gel method and post-annealed at 1100 &lt;sup&gt;o&lt;/sup&gt;C. The grain growth of the sample is very sensitive to the Cu substitution &lt;i&gt;y&lt;/i&gt;. The average grain size of the non-doped sample (&lt;i&gt;x&lt;/i&gt; = 0, &lt;i&gt;y&lt;/i&gt; = 0) was ~400 nm and it increased to ~3 μm at the sample with &lt;i&gt;x&lt;/i&gt; = 0 and &lt;i&gt;y&lt;/i&gt; = 0.2. The real and imaginary parts of permittivities (&lt;i&gt;ε', ε"&lt;/i&gt;) and permeabilities (&lt;i&gt;μ', μ"&lt;/i&gt;) were measured on the spinel ferrite powder-epoxy (10 wt%) composite samples by a network vector analyzer in the frequency range of 0.1 ≤ &lt;i&gt;f&lt;/i&gt; ≤ 15 GHz. The &lt;i&gt;μ'&lt;/i&gt; and &lt;i&gt;μ"&lt;/i&gt; depend on Co substitution &lt;i&gt;x&lt;/i&gt; and the &lt;i&gt;ε'&lt;/i&gt; is sensitive to Cu doping &lt;i&gt;y&lt;/i&gt;. Reflection loss (RL), which implies electromagnetic (EM) wave absorption properties, were analyzed based on the complex permeability, permittivity spectra. In the RL map plotted as functions of sample thickness (&lt;i&gt;d&lt;/i&gt;) and frequency (&lt;i&gt;f&lt;/i&gt;), the intensive EM absorbing area (RL &lt; -30 dB) shifted to a high frequency region with increasing Co substitution. This can be attributed to a permeability spectra shift, due to the increase in ferromagnetic resonance frequency produced by the Co substitution. The samples with &lt;i&gt;x&lt;/i&gt; = 0.1 and &lt;i&gt;y&lt;/i&gt; = 0.1, &lt;i&gt;x&lt;/i&gt; = 0.2 and &lt;i&gt;y&lt;/i&gt; = 0 also exhibited a very broad-ranged EM wave absorbing performance with a &lt;i&gt;d&lt;/i&gt; &lt; 3 mm, indicated by RL &lt; -10 dB being satisfied in the frequency range 7~14 GHz.

Determination of plasmin in milk using QCM and ELISA methods

Quartz crystal microbalance (QCM) biosensor for detection plasmin (PLA) in milk using β-casein as a substrate immobilized at piezocrystal surface was reported. The cleavage of β-casein induced by PLA within the concentration range 0.1–40 nM resulted in an increase of series resonant frequency, fs, and a decrease of motional resistance, Rm, due to removal of short peptide fragments from the crystal surface and decrease of viscosity contribution, respectively. The sensor was verified in both raw and spiked milk samples of various origins (cow, goat, sheep). The sensor response has also been studied for trypsin and α-chymotrypsin activities. Sensor technology achieved a limit of PLA detection (LOD) 167.16 ± 39.36 pM at pH 7.4. Similar LOD, 121.98 ± 18.30 pM, was confirmed by Enzyme Linked Immunosorbent Assay (ELISA) test performed in-parallel with the biosensor measurements. Atomic force microscopy (AFM) confirmed cleavage effect of PLA on the surface covered by β-casein.

Forced vibration of two-degrees-of-freedom machine tool feed system with clearance and friction

The feed system of machine tool has complex nonlinear dynamic behaviors in the process of machining, which will affect the machining accuracy of parts. The two-degrees-of-freedom dynamical model of the feed system with clearance and friction is established, where the torsion and load disturbance are considered. By using the averaging method, the approximate analytical solution of the feed system of the machine tool is solved. The approximate analytical solutions are verified by the numerical solutions, when the worktable moves at a constant speed or the worktable is at the working point. And the approximate analytical solutions are in good agreement with the numerical solutions. According to the Lyapunov stability analysis, the stability of the steady-state solutions of system is judged by the maximum real part of the eigenvalues. The analysis results show that, the amplitude of the amplitude-frequency response of system decreases when the friction force increases. As the clearance increases, the resonance frequency decreases gradually. When the lead of the ball screw increases, the resonance peak and resonance frequency increase gradually. The numerical simulation analysis of the system shows that when the worktable is at the working point, the angle displacement of the lead screw chatters while it reaches the maximum or minimum value of the vibration angle displacement.

A new insight into the vibrational modeling of contact mode for atomic force microscope beams in various immersion ambiances.

In this article, the vibrations of V-shaped beam as the most usable atomic force microscope (AFM) beam in contact mode has been modeled using finite element method. This work is a fundamental issue for contact resonance AFM. We have considered carbon tetrachloride (CCL4 ), methanol, acetone, water, and vacuum the immersion ambiences. For modeling of the beam dynamics, both of the Timoshenko and Euler-Bernoulli beam principles have been used. For presenting the best theoretical model all specifications for AFM beam and sample surface has been assumed. The outcomes show that by raising the interaction force between AFM beam and sample surface, the resonant frequency increases. By diluting the liquid surroundings, the resonant frequency and amplitude of frequency response functions (FRF) of vertical movement increase. The amplitude of FRF increases by raising the beam thickness and rectangular part breadth, but reduces by increasing the rectangular and tapered part lengths. The resonant frequency reduces by boosting the rectangular and tapered parts lengths and rectangular part width, but raises by increasing the beam thickness. Theoretical model in attendance and lack of tip-sample interaction force have been evaluated with experimental works for vacuum and water as the immersion ambiances. Results show good agreement.

Effect of functionalized multi-wall carbon nanotubes/Biresin CR82 epoxy nanocomposite on vibration attenuation of aluminum plate

This article focused on further investigation of passive vibration damping of a cantilever plate using carbon nanotube/epoxy nanocomposite. A damping ratio depends on many factors, for example carbon nanotube content, type of carbon nanotubes, and frequency, so the epoxy composite reinforced with 0.2 wt. % multi-wall carbon nanotubes has been used with structural damping. Dynamic analysis for an aluminum cantilever plate has been studied to determine the effect of the epoxy nanocomposite material on the plate vibration. The main goal of the study was to minimize the frequency response function amplitude and shift the resonant frequency of the plate as high as possible, especially for the fundamental frequency. An finite element model exhibited an increase in the resonant frequency by 10.6% and 1.2% in addition to a reduction in the frequency response function amplitude by 79.5% and 43.26% at the first and second bending modes, respectively, when using 0.2 wt. % multi-wall carbon nanotubes/epoxy circular patches at an optimal position compared with the bare plate. In case of using a stiffener below the plate, the results exposed an increase in resonant frequency by 154.6% and 181.7%, whereas the frequency response function amplitude showed reduction by 95.9% and 98.2% at the first and second bending modes, respectively, when using three stiffeners of multi-wall carbon nanotubes/epoxy nanocomposite with the same mass of circular patches compared also with the bare plate.

Study of the Static and Microwave Magnetic Properties of Nanostructured BaFe12−xTixO19

The effect of Ti substitution on the microwave and magnetostatic properties of nanostructured hexagonal BaFe12−xTixO19 ferrite composites is studied. The microwave permeability is measured in the frequency range of 0.1–22 GHz by a coaxial technique. An analysis of the magnetostatic data is made by the law of approach to saturation. The ferrimagnetic resonance frequencies calculated from the magnetostatic data are consistent with those obtained from the microwave measurements. The natural ferrimagnetic resonance frequencies are located in the frequency range of 15 to 22 GHz, depending on the substitution level x. An increase in the amount of substitution elements results in a low-frequency shift of the ferrimagnetic resonance frequency for samples with x &lt; 1. With x rising from 1 to 2.5, the resonance frequency increases. The results of the study demonstrate that the tailored optimization of the nano-structure of a functional material is a robust tool to fine-tune its microwave magnetic properties. The ferrites under study are promising materials to be applied as functional coatings intended to control electromagnetic interference in microwave devices.