La0.7Ca0.3MnO3 Research Articles

Correlation Microstructure of Triple Phase Boundary and Crystallinity in SOFC Cells NiO/LSGM/LCM

The electrochemical process in the TPB microstructure depends on the conductivity of the SOFC cell constituent materials. Electrolyte and electrode materials must have good conductivity. The crystallinity of an electrolyte can affect its conductivity. In this study, the electrolyte La0.8Sr0.2Ga0.8Mg0.2O3–δ (LSGM) was used and is known to have good conductivity at intermediate temperatures. The single cell of LSGM electrolyte with La0.7Ca0.3MnO3 (LCM) cathode which has high electronic conductivity and NiO anode which has low area-specific resistance (ASR) is expected to produce compatible cells. The production of NiO/LSGM/LCM cells was carried out through the solid-solid phase synthesis method. Microstructural analysis of TPB was performed using SEM-EDS; meanwhile, crystallinity was obtained through XRD analysis. The crystallinity values of NiO, LSGM and LCM cell components above 80% allow the cells to produce high conductivity with a three-phase boundary microstructure from porous electrodes and relatively dense electrolytes which can increase the possibility of gas, ion and electron encounters in the TPB. In SOFC NiO/LSGM/LCM cells, Ni=11.08%; Ca=6.84%; Mn=9.28% and no precipitate is formed at the electrolyte-electrode boundary, so that the electrochemical process on the TPB microstructure could run well.

Impact of NiO nano-particles on colossal magneto-resistance of La0.70Ca0.30MnO3 composite

Mixed-valent perovskite manganite has gained considerable research interest due to the increasing demand for energy storage materials. Herein, we show that colossal magneto-resistance properties of La0.7Ca0.3MnO3 (LCMO) can be changed via nickel oxide (NiO) doping. A two-step conventional solid-state reaction method is used to synthesize LCMO-10% NiO composite. The phase purity, structural, electrical (resistivity), and magneto-transport properties of as-synthesized LCMO-10% NiO composite are detailed. NiO doping shifts metal–insulator transition temperature (TMI) from 263 K to 195 K and increases resistivity. The magneto-resistance (MR) measurements showed 10% NiO doping resulted in a maximum MR of ∼ -70.32% at 200 K (near TMI) and 10 T applied magnetic field. However, -0.0849% MR is seen at 290 K (RT) and 0.3 T. The increased ∼ -63.85% MR is found at 100 K and at 10 T, which is comparatively much higher than the pristine LCMO sample. This is due to the addition of NiO in LCMO that improves physical properties (i.e., grain size).

Tuning the magnetocaloric effect by optimizing thickness-induced three-dimensional strain states

The effect of 3-dimensional strain state on the magnetocaloric properties of epitaxial La0.8Ca0.2MnO3 (LCMO) thin films grown on two types of substrates, SrTiO3 (001) (STO) and LaAlO3 (001) (LAO) has been studied as a function of film thickness within the range of 25 to 300 nm. The STO substrate imposes an in-plane tensile biaxial strain while LAO substrate imposes an in-plane compressive biaxial strain. The in-plane biaxial strain on LCMO by STO substrate gets relaxed more rapidly than that by LAO substrate but both LCMO/STO and LCMO/LAO show a maximum entropy change of 12.1 J/Kg-K and 3.2 J/Kg-K, respectively at a critical thickness of 75 nm (at 6 T applied magnetic field). LCMO/LAO is found to exhibit a wider transition temperature region with full width at half maxima (FWHM) 40 K of the dM/dT vs T curve compared to LCMO/STO with FWHM 33 K of that curve. This broadening of the transition region indicates that the Table like magnetocaloric effect (MCE) is attainable by changing the strain type. The maximum Relative Cooling Power, 361 J/Kg of LCMO/STO and 339 J/Kg of LCMO/LAO is also observed at the thickness 75 nm. The Curie temperature varies with the thickness exploring the variation of ferromagnetic interaction strength due to strain relaxation. The film thickness and substrate induced lattice strain are proved to be the significant parameters for controlling MCE. The highest MCE response at a particular thickness shows the possibility of tuning MCE in other devices by optimizing thickness.

Structural, electrical transport and magnetoresistance properties of La0.7Ca0.3MnO3:ZnO nanocomposites

In the present communication, (1–x) La0.7Ca0.3MnO3 (LCMO) + (x) ZnO (x = 0, 0.10, 0.20) nanocomposites were synthesized by sol–gel method and studied for their charge carrier transport properties. The result of X–ray diffraction (XRD) confirms mixed phases of orthorhombic LCMO with hexagonal ZnO. ZnO admixing does not show any significant change in lattice parameters of LCMO however the peak intensity and crystallinity get suppressed with increase in ZnO content. The samples have been characterized for their electrical transport behaviors using four probe resistivity measurements which confirm that all the studied samples exhibit characteristic insulator to metal transition at temperature TP that decreases with increase in ZnO content. There is a discrepancy in the resistivity values between the LCMO:ZnO nanocomposite samples having the ZnO contents x = 0.10 and 0.20. Variations in the charge carrier transport parameters (i.e. resistivity and TP) with ZnO content have been attributed to the magnetic interactions between manganite and ZnO phases and phase separation scenario in LCMO manganite phase. Various models and mechanisms have been employed to understand the charge conduction processes across the lattices of studied nanocomposites. The largest magnetoresistance (MR) has been seen for x = 0.20 in the LCMO:ZnO nanocomposite which has been attributed to the different distribution possibilities of ZnO within the LCMO manganite lattice of the nanocomposite samples.

Exchange Bias Effect in LaFeO3: La0.7Ca0.3MnO3 Composite Thin Films

Composite thin films arouse great interests owing to the multifunctionalities and heterointerface induced physical property tailoring. The exchange bias effect aroused from the ferromagnetic (FM)–antiferromagnetic (AFM) heterointerface is applicable in various applications such as magnetic storage. In this work, (LaFeO3)x:(La0.7Ca0.3MnO3)1−x composite thin films have been deposited via pulsed laser deposition (PLD) and the exchange bias effect was investigated. In such system, LaFeO3 (LFO) is an antiferromagnet while La0.7Ca0.3MnO3 (LCMO) is a ferromagnet, which results in the exchange bias interfacial coupling at the FM/AFM interface. The composition variation of the two phases could lead to the exchange bias field (HEB) tuning in the composite system. This work demonstrates a new composite thin film system with FM-AFM interfacial exchange coupling, which could be applied in various spintronic applications.

Vertical strain tuning and perpendicular magnetic anisotropy in La0.5Ca0.5MnO3 vertically aligned nanostructured thin films by the application of high magnetic fields

Epitaxial La0.5Ca0.5MnO3 (LCMO) thin films with vertically aligned nanostructures (VANs) have been achieved with the application of high magnetic fields in pulsed laser deposition processing. More interestingly, the microstructures, vertical strain, and perpendicular magnetic anisotropy (PMA) in the LCMO VAN films can be systematically manipulated by changing the applied high magnetic field strength. With increasing the high magnetic field, an increase in growth rate and a decrease in nanocolumn dimension are observed in the LCMO VAN films, which can be attributed to the enhanced suppression effect on adatom mobility and surface diffusion. Different from the LCMO planar-structured films, the intrinsic stress behaviors associated with vertical interfaces and grain boundaries instead of substrate strain in the LCMO VAN films are dominant in vertical strain evolution, indicating an out-of-plane compressive state, which is highly correlated with the growth rate and nanocolumn dimension. A core-shell model based on phase separation is proposed to understand the nanoscale size effect on magnetic properties in the LCMO VAN films. A tunable and enhanced PMA effect in the LCMO VAN films is also demonstrated. The results suggest that the application of a high magnetic field in pulsed laser deposition processing is a practicable route to achieve tunable VANs, and manipulate physical properties in manganite films.

Electron spin resonance studies of (La0.6Ln0.4)0.67Ca0.33MnO3 (Ln = La, Pr, Nd and Sm) nanoparticles at different temperatures

In this work, (La0.6Ln0.4)0.67Ca0.33MnO3 (Ln = La, Pr, Nd and Sm) nanoparticles (NPs) synthesized by sol-gel process were investigated by electron spin resonance (ESR) in the temperature range 100–330 K. At the high temperature the ESR signals of La0.67Ca0.33MnO3 (LCMO) NPs only consist of a single peak with Landé g factor of 2.0. This signal is contributed from the paramagnetic (PM) Mn ions in the LCMO NPs. With decreasing the temperature the PM resonance line is split into two resonance lines, one is ferromagnetic (FM) resonance line shifting towards low field while the other is antiferromagnetic (AFM) resonance line moving to a high field. The resonance peak-to-peak spectra linewidth, increases monotonically with decreasing the temperature owing to the strong double exchange interactions below the Curie temperature (T C). Resonance field is almost temperature independent in the PM phase whereas it drops fast at temperature below T C. Consequently, the Landé g factor in the PM region is very close to 2.0 whereas in the range of 2.17–2.47 under FM state due to the strong FM interactions. For the Pr (Nd)-doped LCMO NPs below T C, their g values are in the range of 2.04–2.18 due to the substantial reduction of the FM interactions caused by the Pr (Nd)-doping at La-site. The g values of the Sm-doped LCMO NPs exhibit a slight fluctuation around 1.88 (but smaller than 2.0) within the measured temperature due to the existence of weak magnetic interactions under the PM states.

Temperature-dependent resistive switching behaviour of an oxide memristor

In this work, we report the temperature-dependent transport and resistive switching behaviour of a promising hybrid structure made of La0.7Ca0.3MnO3 (LCMO) and reduced graphene oxide (rGO). The current-voltage (IV) characteristics are non-linear across the studied temperature range of 100 K–300 K, which is also temperature-dependent. The memristive effect is most prominent at 200 K, while the reduction of hysteresis in the IV-curve with decrease in temperature is ascribed to the low thermal energy of the charge carriers. The charge transport in the SET and RESET process at different temperatures can be explained using trap-controlled space charge limited conduction mechanism for temperature >200 K and Poole-Frenkel emission at temperatures below that.

Effect of NiO Nanoparticle Addition on the Structural, Microstructural, Magnetic, Electrical, and Magneto-Transport Properties of La0.67Ca0.33MnO3 Nanocomposites

Incorporation of the secondary oxide phase into the manganite composite capable of enhancing low-field magnetoresistance (LFMR) for viability in high-performance spintronic applications. Polycrystalline La0.67Ca0.33MnO3 (LCMO) was prepared via the sol–gel route in this study. The structural, microstructural, magnetic, electrical, and magneto-transport properties of (1−x) LCMO: x NiO, x = 0.00, 0.05, 0.10, 0.15 and 0.20 were investigated in detail. The X-ray diffraction (XRD) patterns showed the coexistence of LCMO and NiO in the composites. The microstructural analysis indicated the amount of NiO nanoparticles segregated at the grain boundaries or on the surface of LCMO grains increased with the increasing secondary phase content. LCMO and NiO still retained their individual magnetic phase as observed from AC susceptibility (ACS) measurement. This further confirmed that there is no interfacial diffusion reaction between these two compounds. The NiO nanoparticle acted as a barrier to charge transport and caused an increase in resistivity for composite samples. The residual resistivity due to the grain/domain boundary is responsible for the scattering mechanism in the metallic region as suggested by the theoretical model fitting, ρ(T)=ρ0+ρ2T2+ρ4.5T4.5. The magnetoresistance values of LCMO and its composites were found to increase monotonically with the decrease in temperature. Hence, the LFMR was observed. Nonetheless, the slight reduction of LFMR in composites was attributed to the thick boundary layer created by NiO and impaired the spin polarised tunnelling process.

Silver decorated lanthanum calcium manganate for electrochemical supercapacitor

Perovskite La0.5Ca0.5MnO3 (LCM) based materials are promising for electrode construction but their poor conductivities often lead to limited electrochemical performances. In this work, LCM was combined with Ag through the two-step process based on sol-gel and silver mirror reaction. The as-obtained LCM@Ag composites were characterized by scanning electron microscopy and x-ray powder diffraction. The mass percent determined by energy disperse spectroscopy combined with x-ray photoelectron spectroscopy was estimated at 5%. The electrochemical measurements showed LCM@Ag to possess superior specific capacitance of 287 C g−1 (179 F g−1) at 1.5 A g−1 while pure LCM delivered only 187 C g−1 (117 F g−1). The key to the improvement of performance can be attributed to the silver nanoparticle introduction, which leads to the enhancement of the electron transport capacity and ion diffusion for the composite. Meanwhile, the cycle stability slightly improved and the retention rate after 3,000 cycles at 10 A g−1 reached 66%. In sum, La0.5Ca0.5MnO3 perovskite system looks promising for electrode construction, where silver modification could improve the overall electrochemical properties.

Structural and Electrical Properties of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> /α-Fe<sub>2</sub>O<sub>3</sub> Composites

Colossal magnetoresistive (CMR) materials have huge potential in modern application and it has been widely used in magnetic sensing industry. From the literature, an incorporation of secondary insulating phase into mixed-valence manganites could improve its extrinsic effect especially low-field magnetoresistance (LFMR). However, nanoparticle addition could lead to substitution and diffusion with its parent compound. In this work, the structural and electrical properties of La0.7Ca0.3MnO3 (LCMO) were investigated by adding the α-Fe2O3 nanoparticle with ratio of 0.00, 0.05, 0.10, 0.15 and 0.20 as the artificial grain boundaries. The LCMO compound has been synthesised using sol-gel route. The samples were chosen to sinter at 800°C to obtain the pure LCMO phase by referring to the thermogravimetric analysis (TGA). The structural properties were investigated by an X-ray diffractometer (XRD) while electrical properties were measured by a four-point probe (4PP) system. XRD patterns showed the coexistence of two phases (LCMO & α-Fe2O3). LCMO crystallised in orthorhombic structure with space group Pnma while α-Fe2O3 exhibited in hexagonal form with space group R-3c. As the content of α-Fe2O3 increases, the resistivity of the samples increases drastically. Nevertheless, the addition of iron oxide has no significant effect on the metal-insulator transition temperature (T­MI). From the XRD and 4PP analysis, it can be deduced that the α-Fe2O3 nanoparticles do not react with LCMO compound and successfully formed the La0.7Ca0.3MnO3 /α-Fe2O3 composites. The resistivity increases when the nano-sized α-Fe2O3 is added into LCMO nanocomposites due to the insulator nature of α-Fe2O3.

Resistive and magnetoresistance behaviors of BiFeO3 incorporated La0.7Ca0.3MnO3 composites

Micronsized matrix of La0.7Ca0.3MnO3 (LCMO) was synthesized by solid state reaction route whereas BiFeO3 (BFO) nanoparticles were synthesized by sol–gel method. Different contents of BFO nanoparticles were incorporated into the micronsized LCMO matrix lattice to prepare their composites. X–ray diffraction (XRD) measurement was performed to understand the crystalline phases present in these composites. Structural investigation suggests the dual phase nature of all the composites (consist of LCMO and BFO phases). No extra phases other than two, LCMO and BFO phases, can be found in the XRD patterns. Transport and magnetotransport properties have been studied by recording the temperature and magnetic field dependent resistance of the composites. Resistivity behavior shows that all the composites exhibit metal to insulator transition at TP which is highly sensitive to magnetic field and BFO content. The values of resistivity are also influenced by the applied magnetic field and BFO content in the composites. Since all three composites with different BFO contents (i.e. 0, 10 and 20%) exhibit low temperature resistivity minimum behavior, various theoretical models and mechanisms have been employed to understand the responsible charge conduction across the composite lattices. All composites exhibit negative magnetoresistance (MR) which has been discussed in detail on the basis of role of high resistive nanoparticles of BFO incorporated within the micronsized LCMO matrix.

Thickness dependent electrical resistivity modulation in tensile-strained epitaxial thin films of calcium manganese oxide

We report our studies of the thickness dependence of electrical resistivity and lattice constants in strained epitaxial thin films of calcium manganese oxide. Our results indicate the potential of bi-axial lattice mismatch strain as a handle for modulating electrical resistivity. We observe thickness dependence of lattice constants consistent with what is expected for strain relaxation for films thicker than 400 Å. At lower thickness values, anomalies are observed suggestive of reduced oxygen stoichiometry. We observe a remarkable decrease in electrical resistivity with decreasing film thickness. The resistivity of our thinnest films (5–7 nm) is about three orders of magnitude lower than the resistivity of bulk CaMnO3. Resistivity increases as the film thickness increases, along with the progression of strain relaxation. It is noteworthy that the thickness dependence of resistivity we observe in CMO thin films is the opposite of what has been reported for their hole-doped rare earth manganite counterpart La0.67Ca0.33MnO3 (LCMO), where tensile lattice mismatch strain suppresses metallicity, leading to the increase in resistivity with film thickness. We believe that the enhanced conductivity in our thinnest films is related to the possible oxygen deficiency promoted by tensile strain. Recent x-ray absorption measurements have revealed reduced oxygen content and associated changes in Mn valence states in tensile-strained CMO thin films, as also predicted by density functional theory calculations. This report is the first observation of electrical transport behavior possibly indicative of strain–oxygen stoichiometry coupling.

Modulating the transport property of flexible La0.67Ca0.33MnO3 thin film by mechanical bending

Flexible epitaxial La0.67Ca0.33MnO3 (LCMO) thin films are fabricated on an SrTiO3 buffered (001)-oriented fluorophlogopite substrate. The metal-to-insulator transition tends toward lower temperature when subjected to mechanical bending. Moreover, the transport behavior of the bent LCMO films in the insulating region follows the variable range hopping model and the resistivity increases with the reduction in the bending curvature radii because the applied strain aggravates the distortion of the LCMO crystal structure, decreases the hopping distance, and, hence, impedes the transport of charge carriers. The resistivity change induced by the mechanical bending can go up to 104% at 100 K and 105% at 10 K. Such a large resistivity change makes the flexible LCMO thin film promising as a mechanical-bending switch device at low temperature.

A comparative study on high TCR and MR of La0·67Ca0·33MnO3 polycrystalline ceramics prepared by solid-state and sol-gel methods

In this work, La0·67Ca0·33MnO3 (LCMO) polycrystalline ceramics were fabricated by solid-state (SS) and sol-gel (SG) methods. Morphologies, crystal structures, element compositions, and contents of as-obtained LCMO ceramics were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and X-ray photoemission spectroscopy (XPS). Compared to the SG ceramic, specimens fabricated by SS showed numerous smaller grain size particles and scattered grain boundaries (GBs), leading to higher resistivity. Values of the peak temperature coefficient of resistivity (TCR) of both LCMO ceramics prepared by SS and SG were recorded as 14.12% at 261.73 K and 31.96% at 260.64 K, respectively. Respective magnetic resistance (MR) values were estimated to 29.97% at 264.78 K and 54.27% at 263.80 K, respectively. Also, SG sample displayed LCMO polycrystalline with better crystal quality, as well as improved electrical and magnetic properties. Hence, SG method was more suitable for preparation and application of LCMO ceramics, especially for use in highly sensitive infrared detectors and magnetic sensors.

Fabrication of the La0.67Ca0.33MnO3 patterns and investigation on I-V characteristic of La0.67Ca0.33MnO3/Nb:SrTiO3

In this paper, 2,2′-bipyridine (BPY) was used as a chemical modifier to prepare the La0.67Ca0.33MnO3 (LCMO) UV-sensitive sol. The LCMO film was micro-fabricated by the UV-sensitivity of sol, which resulted in LCMO patterns with micron-scale microstructures. The micro-fabrication method was further applied in the preparation of LCMO dot array on the Nb:SrTiO3 (NSTO) substrate to form In/LCMO/NSTO heterostructure. The I-V curve of the In/LCMO/NSTO structure exhibited an obvious I-V hysteresis window which indicated that the resistive switching (RS) effect occurred. It is analyzed that the RS effect results from the barriers change at the In/LCMO and LCMO/NSTO interfaces. Further tests revealed that the In/LCMO/NSTO structure could exhibited two different I-V characteristics when the limiting current was 1 and 10 mA respectively, and the mechanisms with these two different limiting currents are analyzed based on the interface barrier, Space-charge-limited current mechanism and Fowler-Nordheim tunneling mechanism.

Influence of Al2O3 on the low-field magnetoresistance of sol–gel grown La0.67Ca0.33MnO3:Al2O3 nanocomposites

Low-field magnetoresistance (LFMR) is required by the high-efficiency magnetic devices and it can be achieved by introducing a secondary insulating phase which acts as the artificial barrier layer in manganite composite. However, this will induce a higher resistivity in the composites. In this work, (1 − x) La0.67Ca0.33MnO3 (LCMO):x Al2O3 (x = 0.00, 0.05, 0.10, 0.15, and 0.20) composites have been prepared by the Pechini sol–gel method. Their structural, magnetic, electrical, and magneto-transport properties were systematically studied to determine the relationship between the LFMR and the concentration of Al2O3. X-ray diffraction (XRD) pattern indicates that LCMO and Al2O3 coexisted in the composites, indicating that Al2O3 is segregated outside the LCMO grains. Pure LCMO and its composites behaved as a paramagnetic state in room temperature. The TMI value has been suppressed in composites resulting from the weak connectivity between grains. The enhancement of LFMR can be observed in the broad range of temperatures (80–240 K) for all samples. More interestingly, a slight reduction of LFMR has been demonstrated by the composite samples. The spin-polarised tunnelling that is responsible for LFMR in composites of this work might be dominated by the nanosized LCMO or restricted by the thick boundary layers of Al2O3 phase. This is a significant finding to the existing works of LCMO:Al2O3 composites, as Al2O3 has improved the LFMR in composites from the available literature.

A mechanical rotatable magnetic force microscope operated in a 7 T superconducting magnet

We present a mechanical rotatable magnetic force microscope (MFM) with precise angle control that can be operated in a 7 T superconducting magnet. An inertial piezoelectric motor called a SpiderDrive was used for the coarse approach because of its high compactness, high rigidity, and small size. Due to the mechanical rotation design, the MFM head can be rotated in a 7 T superconducting magnet with a bore size of 89 mm so that the direction of the magnetic field can be changed from 0° to 90° continuously. The highest in-plane magnetic field strength tested was 7 T. This is the first rotatable MFM ever reported. Using the homemade rotatable MFM, we investigated a 40 nm thick La0.67Ca0.33MnO3 (LCMO) thin film on NdGaO3 (100) substrate with anisotropy, determining that the charge-ordering insulating (COI) phase of the LCMO disappears as the direction of the magnetic field changed from 0° to 90°. Furthermore, the ferromagnetic pattern, appearing as bright and dark contrasts and similar to that formed by the S and N of a magnet, was seen parallel to the direction of the magnetic field. The rotatable MFM in this paper is expected to be widely used in studying the anisotropy of magnetic materials.

Structural, Magnetic and Magnetotransport Properties of Sol-Gel Synthesized La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub>:TiO<sub>2</sub> Nanocomposite

Colossal magnetoresistive (CMR) materials have been widely studied because of their huge potential in spintronic technology. An introduction of secondary phase to the manganite matrix is able to improve the low field magnetoresistance (LFMR). This method is favoured by recent research works as it requires a lower magnetic field compared to intrinsic magnetoresistance. Structural, magnetic properties and magnetotransport properties of polycrystalline (1-x) La0.67Ca0.33MnO3 (LCMO): x TiO2 composites where x = 0.00, 0.05, 0.10, 0.15 and 0.20 were investigated in this work. Polycrystalline La0.67Ca0.33MnO3 (LCMO) was synthesized via sol-gel method and pre-sintered at 800 °C before appending with nano-sized TiO2. All samples are in LCMO phase having an orthorhombic structure with space group Pnma. The crystal structural parameter is studied by using Rietveld refinement. As TiO2 content increases, the magnetization is getting higher as observed via vibrating sample magnetometer (VSM) analysis at room temperature. Magnetotransport properties of the pure LCMO sample have been studied from 80 – 220 K. The LFMR is enhanced as the temperature drops. The results have shown LCMO: TiO2 manganite composite is an excellent candidate for future magnetic sensors and memory devices.

Vertically aligned nanostructure control and tunable low-field magnetoresistance in La0.5Ca0.5MnO3 single-phase thin films manipulated by a high magnetic field

Vertically aligned nanostructured (VAN) epitaxial La0.5Ca0.5MnO3 (LCMO) single-phase thin films have been achieved on (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) [LSAT (001)] substrates under high magnetic fields applied in pulsed laser deposition processing. Low-field magnetoresistance (LFMR) in the LCMO VAN films can be effectively manipulated through varying the high magnetic field strength. The tunability of VAN on the electrical transport properties is dependent on control of the high magnetic field on the microstructures, including the geometrical arrangement, vertical interfaces, and vertical grain boundaries (GBs). An LFMR value as high as 45% at 150 K and 1 T has been achieved in an LCMO VAN film grown at 10 T, and its LFMR values are larger than 25% at 127–200 K and 1 T. The tunable and enhanced LFMR in the LCMO VAN films over a wide temperature range can be attributed to the increase in vertical interfaces and GB density with the increasing high magnetic field, which are highly related to the spin-polarized tunneling effect. Applying a high magnetic field in film deposition to control the microstructures of VAN single-phase films is a feasible route to achieve tunable and desirable physical properties.