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Structural inversion asymmetry together with spin-orbit coupling can induce interfacial Dzyaloshinskii-Moriya Interaction (iDMI) in Heavy-Metal/Ferromagnet/Metal-Oxide heterostructuctures [1]. In such thin film systems with perpendicular magnetic anisotropy the iDMI combined with dipolar interactions can stabilize non-collinear chiral magnetic spin textures such as Néel Domain Walls (DWs), eventually forming magnetic skyrmion bubbles [2]. The iDMI amplitude and sign determine the spin texture of the DWs and their chirality [3]. Moreover, skyrmions can be moved by a current thanks to spin orbit torques, in a direction depending on their chirality.&lt;br/&gt;&lt;br/&gt;In this study we report on a deterministic control of their motion related to a chirality switch of magnetic skyrmion bubbles in Ta/FeCoB/TaOx trilayer, covered by a ZrO&lt;sub&gt;2 &lt;/sub&gt;ionic conductor (Fig. 1a). Monitored under a polar-Magneto-Optical Kerr-Effect (p-MOKE) microscope we apply a gate voltage through a transparent Indium Tin Oxide (ITO) electrode and demonstrate by real space tracking the reversal of their current-induced motion (Fig. 1b). Micromagnetic simulations together with similar measurements on magnetic domain walls confirm the possibility to invert the chirality, eventually leading to versatile spintronic and logic devices.&lt;br/&gt;&lt;br/&gt;We have furthermore optimized the fabrication of skyrmion Hall-bar tracks (Fig. 2a), containing magnetic skyrmion bubbles (Fig. 2b), with deported ITO top electrodes. These skyrmion racetracks of different shapes and sizes allow to assess the effect of gate voltage and lateral confinement on the skyrmion motion. Eventually, the gate would play the role of a pinning potential and control the skyrmion velocity. In a similar Hall-bar geometry with multiple Hall-contacts we envision to demonstrate the electrical tracking of a moving skyrmion in replacement for the MOKE images that are limited in temporal and spatial resolution.

![](https://assets.underline.io/uploads/markdown_image/1/image/72f0bad1edbe95eec301d09cc8f44523.jpg)

![](https://assets.underline.io/uploads/markdown_image/1/image/ce72f946d632a2abff10be5391d298b4.jpg)

Gate-Controlled Skyrmions in Magnetic Trilayer Tracks

2022 Joint MMM-INTERMAG

Gate-Controlled Skyrmions in Magnetic Trilayer Tracks

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INTERMAG 2021

Structural inversion asymmetry together with spin-orbit coupling can induce interfacial Dzyaloshinskii-Moriya Interaction (iDMI) in Heavy-Metal/Ferromagnet/Metal-Oxide heterostructuctures [1]. In such thin film systems with perpendicular magnetic anisotropy the iDMI combined with dipolar interactions can stabilize non-collinear chiral magnetic spin textures such as Néel Domain Walls (DWs), eventually forming magnetic skyrmion bubbles [2]. The iDMI amplitude and sign determine the spin texture of the DWs and their chirality [3]. Moreover, skyrmions can be moved by a current thanks to spin orbit torques, in a direction depending on their chirality. In this study we report on a deterministic control of their motion related to a chirality switch of magnetic skyrmion bubbles in Ta/FeCoB/TaOx trilayer, covered by a ZrO2 ionic conductor (Fig. 1a). Monitored under a polar-Magneto-Optical Kerr-Effect (p-MOKE) microscope we apply a gate voltage through a transparent Indium Tin Oxide (ITO) electrode and demonstrate by real space tracking the reversal of their current-induced motion (Fig. 1b). Micromagnetic simulations together with similar measurements on magnetic domain walls confirm the possibility to invert the chirality, eventually leading to versatile spintronic and logic devices. We have furthermore optimized the fabrication of skyrmion Hall-bar tracks (Fig. 2a), containing magnetic skyrmion bubbles (Fig. 2b), with deported ITO top electrodes. These skyrmion racetracks of different shapes and sizes allow to assess the effect of gate voltage and lateral confinement on the skyrmion motion. Eventually, the gate would play the role of a pinning potential and control the skyrmion velocity. In a similar Hall-bar geometry with multiple Hall-contacts we envision to demonstrate the electrical tracking of a moving skyrmion in replacement for the MOKE images that are limited in temporal and spatial resolution.

![](https://assets.underline.io/uploads/markdown_image/1/image/72f0bad1edbe95eec301d09cc8f44523.jpg)

![](https://assets.underline.io/uploads/markdown_image/1/image/ce72f946d632a2abff10be5391d298b4.jpg)

Gate-Controlled Skyrmions in Magnetic Trilayer Tracks

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The 15th Joint MMM-INTERMAG Conference (2022 Joint) is sponsored jointly by AIP Publishing and the IEEE Magnetics Society. Members of the international scientific and engineering communities interested in recent developments in fundamental and applied magnetism are invited to attend and contribute to the technical sessions. The technical program will include invited and contributed papers in oral and poster sessions, invited symposia, a plenary session, and an evening session, with about 1500 presentations overall. This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

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Magnetostrictive materials represented by Terfenol-D, Galfenol and Fe-Co have the advantages of high energy density, fast response speed, control accuracy and high displacement resolution，and have been widely used in the fields of precision machining, ultrasonic cleaning, actuator. Under the condition of high frequency excitation, there are more hysteresis loss, eddy current loss, copper loss of excitation winding in the magnetostrictive device. The existence of various losses will change the temperature value and distribution of the material. Due to the temperature-sensitive properties, the material exhibits different magnetic and mechanical properties at different temperatures. If only the magnetic properties at room temperature are used to analyze the various performance of the magnetostrictive device in actual work, the analysis results will appear large deviations from the actual phenomenon. Therefore, it is necessary to accurately analyze the magnetic properties of magnetostrictive materials at different temperatures. Reference [1] tested the high frequency characteristics of Terfenol-D and improved the traditional loss separation formula based on the loss test data. Reference [2] measured and analyzed the magnetic and loss characteristics of ferrite, nanocrystal and amorphous alloy. On this basis, a temperature-controllable high-frequency magnetic characteristic test system is built based on the AMH-1M-S dynamic magnetic characteristic tester and a thermostat. The high-frequency magnetic properties of Terfenol-D, Galfenol and Fe-Co at different temperatures (10-80°C) were measured, and a comparative analysis was made from the magnetic domain rotation and mechanism. The results show that the three samples have the same change trend affected by temperature, but the degree of change is obviously different. Among them, Terfenol-D has the strongest temperature sensitivity and the largest magnetic energy loss. Figure 1 shows the hysteresis loops of the three materials. Figure 2 shows the loss trend of the three samples at different temperatures.

![](https://assets.underline.io/uploads/markdown_image/1/image/c3f4432877943ab0f51f966dc12fd20f.jpg)

Fig.1. The hysteresis loop of three materials (f=10 kHz, Bm=0.06 T, ΔT= 20°C)

![](https://assets.underline.io/uploads/markdown_image/1/image/86d282f7234c7040115fc5cb5a072288.jpg)

Fig.2. The loss trends of three materials at different temperatures (f=10 kHz, Bm=0.06 T)

Analysis and Experimental Research on High Frequency Magnetic Properties of Different Magnetostrictive Materials Considering Temperature Effect

Eu2In was recently reported to exhibit a giant nonhysteretic magnetocaloric effect due to a first-order magnetic phase transition with a small phase volume change of approximately 0.1% around TC = 55 K [1]. We present magnetic and compute magnetocaloric properties of a Eu2In compound using a microscopic description based on a model Hamiltonian that takes into account magnetic exchange and magnetoelastic interactions [2]. In the model the thermodynamic nature of the transition is conveniently represented by a single magnetoelastic interaction parameter. A good agreement between the theoretical results and earlier published experimental data confirms the effectiveness of our approach. Keywords: Hysteresis; magnetocaloric effect; intermetallic compounds; magnetoelastic.

Theoretical investigation of the nonhysteretic first-order phase transition of Eu2In through free-energy analysis

Hybrid magneto-elasto-optical systems have the potential to translate surface strain into a color change for structural health monitoring (SHM), mediated by the magnetic coupling between two different functional materials, specifically magnetostrictive and magnetochromatic materials. This hybrid system has the potential to be applied as a paint to large structures, therefore small particle sizes are needed to allow the particles to stay suspended in solution. In this work, polymer-matrix composites with magnetostrictive Fe-Al alloy particles are evaluated to determine the magneto-elastic coupling properties in composite patches attached to a surface prior to understanding the hybrid magneto-elasto-optical interaction. Fe-Ga alloy (Galfenol) powders are usually considered for use in magnetorheological (MR) fluids, MR elastomers for tactile sensors, and SHM systems as composite patches to detect ultrasonic guided waves [1-5]. Figure 1 shows changes of magnetic properties as functions of Alfenol particle fraction and shape, associated with the magneto-elastic coupling effect under compressive stress along the out-of-plane direction. A tension apparatus was also designed to control applied stress precisely to the composite patches attached on dog-bone specimens in a solenoid coil. Flake-shaped particles are more sensitive to increases in applied stress than spherical particles. In addition to the static state, Alfenol MPCs with flake-type powders exhibited better sensing performance than Galfenol ones at frequencies of 120 kHz using ultrasonic guided wave techniques.

![](https://assets.underline.io/uploads/markdown_image/1/image/cecc9dc45f21565956e9a9cefcde1ca7.jpg)

Figure 1. Magnetic properties of composites and particle images; (a)-(b) magnetization and initial permeability as functions of particle shape and weight fraction, where average particle size in diameter was 80 μm and magnetic field was applied out of the plane of the composite patch during curing, (c) permeability changes as a function of compressive stress using a clamping shaft collar to squeeze disc patch on a vertical VSM sample holder, and (d) SEM images of flake and spherical type Alfenol powders with a size of 106-150 μm in diameter, where flake powders were prepared from gas-atomized powders using a wet ball milling process

Static and dynamic magneto-elastic sensing properties of Fe-Al alloy powder-epoxy composite patches

In this work, an investigation of the effect of magnetic particles with different aspect ratios on the effective magnetization response of magnetorheological elastomers (MREs) was carried out. MREs are composites that consist of magnetically permeable particles dispersed in a nonmagnetic polymeric matrix [1]. These materials are well known due to their tunability property. When subjected to an externally applied magnetic field, changes occur in their mechanical properties leading to the so-called magnetorheological (MR) effect [2]. This is often attributed to the magnetic interaction among the magnetic filler particles [3]. Several factors significantly influence the MR effect such as the polymer matrix, particles-volume fraction, size, and shape of the magnetic particles [4]. In this study, based on continuum formulation theory, microscale modeling using a finite element analysis (FEA) was used to determine the effect of the latter on the macroscopic magnetization of MREs. Using Jiles-Atherton hysteresis model parameters, the hysteresis loops of MRE were numerically resolved in the FEA software, COMSOL Multiphysics [5]. The simulations were performed for randomly oriented (unaligned) and aligned microstructures with a constant particle-volume fraction (φ= ~20%) and varying particle-aspect ratios (AR=1, 2.5, 5, and 7.5). A computational homogenization scheme is used to relate the microscopic behavior to the macroscopic properties of these composites. From the analysis, it was found that for unaligned MRE the effective magnetization increased with an increase in the particle-aspect ratio particularly in the linear region, the saturation magnetization is seen to be independent of the particle shape (see Fig. 1a). This effect is much more noticeable for particles aligned with the applied field (see Fig. 1b). While for particles aligned perpendicular to the applied field, an opposite effect is seen where increasing aspect ratio resulted in decreasing of magnetization relative to the applied field.

![](https://assets.underline.io/uploads/markdown_image/1/image/673dfe975f4e9f5f93d9f4391801799d.jpg)

Effective magnetization behavior for a) unaligned MRE with varying particle-aspect ratios

![](https://assets.underline.io/uploads/markdown_image/1/image/51957b3197e5d077bdeb8f450137abdd.jpg)

Effective magnetization behavior for b) aligned MRE with different particle-aspect ratios

Study of Effective Particle Shape-Dependent Magnetization Behavior of Soft Magnetic Polymeric Composites

In recent years, various methods have been reported to boost the magneto-optical (MO) response. Several works have reported the enhancements of the MO response relying on the plasmonic effects attributed to the strongly confined electromagnetic field in the structures1-3. However, the nonnegligible disadvantage of this approach is the optical losses due to the high absorption coefficient of the metal materials1. Therefore, combining the all-dielectric metasurfaces which have high-refractive-index and low intrinsic loss with planar photonic structures offers an alternative route to these problems4,5 .But most of the observations so far are focused on enhancement of existing magneto-optical effects in planar MO thin films. A high index contrast, all dielectric magneto-optical metasurface featuring strong Mie resonance modes have not been fabricated. Here, we report observation of circular displacement current induced novel magneto-optical effects in a high index contrast Si/Ce:YIG/YIG/SiO2 all dielectric metasurface. We observe giant transverse magneto-optical Kerr effect (TMOKE) up to 7 % under s-polarized incidence, which is non-existent in planar magneto-optical thin films. This phenomenon is essentially originated from the unique circular displacement current when exciting the magnetic resonance modes, which changes the incident electric field direction locally. These results indicate promising potential of controlling light propagation by utilizing the complex Mie resonance modes in magneto-optical all dielectric metasurfaces. Our work may inspire the development of novel magneto-nanophotonic devices such as vectoral magnetic field sensing, free space non-reciprocal photonic devices and magneto-optical imaging.

![](https://assets.underline.io/uploads/markdown_image/1/image/d3d7bd3c840418fd37285dae4d310845.jpg)

Figure 1. (a) Schematic diagram of the metasurface. (b) Scanning electron microscope image of a fabricated device.

![](https://assets.underline.io/uploads/markdown_image/1/image/22950e3df3d860eae0c79b53767f7e8a.jpg)

Figure 2. (a) Schematic diagram of s-polarized TMOKE characterization set-up. (b)Measured s-polarized TMOKE and reflection spectra of the metasurface compared with bare Ce:YIG/YIG thin films. (c) Measured TMOKE hysteresis for the metasurface and the bare MO films at 1230 nm wavelength. (d) Simulated reflection spectra and TMOKE responses of the metasurface for s-polarized light.

Circular Displacement Current induced Novel Magneto-Optical Effects in All-dielectric Metasurfaces

Recently, the range of applications of magnetic emulsions has significantly expanded due to the development of microfluidics [1] and biomedical technologies [2]. Using magnetically sensitive emulsions, methods have been proposed for measuring the viscosity and surface tension of liquids [3] and even for determining the content of methyl alcohol [4]. In this work, we present the results of a study of the effect of diffraction scattering of light in magnetic emulsions with low interfacial tension, synthesized based on AMG-10 hydraulic oil. Magnetic emulsions were produced by mixing kerosene-based magnetic fluid in AMG-10 hydraulic oil. The size of microdroplets could vary from 1000 to 7000 nm. To study the effect of diffraction scattering of light, an optical setup was used, which consisted of a helium-neon laser with a radiation wavelength of 633 nm, a cylindrical cuvette, and a screen. The image of the diffraction pattern was recorded by the CMOS matrix of a camera. Image processing was performed using specialized software ImageJ. The sample cuvette was a glass cylinder, fixed on a fluoroplastic tube driven by a DC motor with a belt drive. The range of rotation frequencies was 9–200 rpm. The diffraction pattern is oriented in the direction perpendicular to the long axes of the elongated microdroplets. When the cell is rotated, the droplet axes deviate from the direction of the magnetic field along the direction of rotation, which leads to a rotation of the diffraction band relative to the initial direction. The deflection angle depends on the cell rotation speed and the magnetic field strength (Fig. 1 and Fig. 2). The interpretation of the effect of diffraction scattering in magnetic emulsions is based on considering the diffraction of light by an irregular structure of elongated microdroplets of various sizes, located randomly. Calculations give a result that is in complete agreement with the experiment. This work was financially supported by the Ministry of Science and Higher Education of Russia (project no. 0795-2020-007).

![](https://assets.underline.io/uploads/markdown_image/1/image/e6e5e813cc0937954adfe430afa77353.jpg)

Photographs of the diffraction pattern at the various magnetic fields and rotation speeds

![](https://assets.underline.io/uploads/markdown_image/1/image/d097e27fe9c0f03ed59cd09cccf39265.jpg)

Dependence of the angle of rotation on the rotation speed (magnetic field is H=2 kA/m)

Light diffraction in rotating magnetic emulsions in a magnetic field

Iron-based garnet films that have large magneto-optical (MO) effect are a promising material for MO device applications. In particular, terbium iron garnet (TbIG) can crystallize directly on a Si substrate without garnet seed layers [1-4] and, therefore, recent investigations show quite practical optical isolators taking advantage of TbIG [1,2]. However, crystallization for TbIG requires high temperatures and it is desirable to limit the heating to those regions of the chip where devices are formed. In this study, we compare the structure, magnetic and MO properties of TbIG and Bi doped TbIG (Bi-TbIG) films processed by rapid thermal annealing (RTA) to those annealed locally using an embedded resistor with 40-μm-square area. TbIG (Tb2.77Fe5O12) and Bi-TbIG (Bi0.02Tb2.82Fe5O12) films are made by pulsed laser deposition at room temperature, which allows for liftoff patterning using a photoresist mask. The crystal structure for the films is characterized by micro-Raman spectroscopy and X-ray diffraction (XRD) and the magnetic properties by vibrating sample magnetometry. XRD shows single phase garnet after RTA 1073 – 1273 K. Raman spectra for Bi-TbIG film before/after 1173 K annealing and for the Si substrate are shown in Fig. 1. The Raman spectrum for the as deposited film is almost the same as that of the Si substrate while a Raman peak corresponding to the strongest peak of TbIG (Eg) is observed around 261 cm-1 in the annealed film. Raman spectroscopy enables detection of local crystallization in Bi-TbIG on embedded resistors. Figure 2 shows room temperature in-plane M-H loops of the annealed TbIG and Bi-TbIG films. The TbIG film is not saturated at 1 T while the Bi-TbIG is saturated at 0.7 T. Coercivity in TbIG rapidly increases in the vicinity of the compensation temperature (Tcomp) [3] which is ~250 K for bulk TbIG, and slightly lower for thin film TbIG with Tb deficiency [4]. Bi doping lowers (Tcomp) further [4] explaining the easier saturation of the Bi-TbIG film. The high figure of merit of Bi-TbIG and its higher remanence make this material attractive for integrated photonic devices.

![](https://assets.underline.io/uploads/markdown_image/1/image/db285f5491540908bdd48574e79691ed.jpg)

![](https://assets.underline.io/uploads/markdown_image/1/image/ff4aa0a91ef334bb9894df68b9074960.jpg)

Crystallization of magneto-optical bismuth terbium iron garnet films

Graphene (Gr) is a particularly interesting material for spintronic and technological applications due to its low intrinsic spin orbit coupling and hyperfine interaction, which lead to high spin lifetimes and coherence lengths [1]. Furthermore, it is common in spintronic applications to introduce a structural isomorph to Gr, hexagonal Boron Nitride (hBN) to improve lattice matching in heterostructure engineering[2]. Specifically for spintronic and spin-caloritronic applications, a ferrimagnetic (FM) layer is often used as a magnon source. Therefore, it is important to understand the interfacial properties of FM/Gr(hBN) interfaces. Here, we explore the change in magnetic anisotropy in the FM insulator Nickel Ferrite (NFO) due to the inclusion of monolayer Gr and hBN. This was done by performing radio frequency transverse susceptibility measurements utilizing a tunnel diode oscillator technique, which is a sensitive probe of the system’s effective anisotropy[3]. Specifically, in-plane (IP) and out-of-plane (OOP) measurements were taken for bare NFO, NFO/Gr, NFO/hBN samples. We find that the inclusion of the Gr layer reduces the overall anisotropy for both IP and OOP drastically, by a factor of 2, in the entire temperature of 20 – 300 K. On the other hand, the inclusion of the hBN layer slightly reduces the in-plane anisotropy at low temperature (T &lt; 180 K) but increases it at high temperature (T &gt; 180 K). Since NFO is an insulator and Gr is a semimetal there is a large conductivity difference at the interface which likely leads to charge transfer reducing the overall anisotropy[4]. This is further supported by the less drastic change with the inclusion of monolayer hBN, a semiconductor. Relative to NFO, magnetometry measurements show an enhancement of the saturation magnetization in NFO/Gr and NFO/hBN, highlighting an additional role played by the magnetic proximity effect.

Proximity and Charge-Transfer Mediated Magnetism at Nickel Ferrite Interfaces with Graphene and Hexagonal Boron Nitride Monolayers

Over the past few years, the magnetic proximity effect (MPE) has gained intense attention of the magnetic community.[1] Despite the fact that the influence of MPE in bilayers of ferromagnetic (FM) and antiferromagnetic (AFM) materials has been extensively investigated, studies on MPE in bilayers of a FM and a non-collinear magnet are rather limited. Manganese Phosphide (MnP) is a well-known metallic magnet with helical spin configurations at low temperatures.[2-3] Our recent study on highly crystalline MnP thin films has shown the presence of strain-mediated magnetism with two magnetic transitions: a paramagnetic (PM) to FM transition at TC ~ 279 K and a FM to helimagnetic transition at TN ~ 110 K.[2] This finding has motivated us to investigate how the helimagnetic spin texture of the MnP film is influenced when another FM layer is placed in its close proximity. To address this, we sputtered a 5 nm Fe film on the 100 nm MnP film, with a 2 nm-thick capping layer of Ta, at room temperature. Magnetometry measurements show a large increase in TC and a large decrease in TN for the Fe/MnP bilayer (TC ~ 300 K and TN ~ 75 K) relative to the MnP sample (TC ~ 279 K and TN ~ 110 K), indicating the presence of strong MPE. The M-H data indicate that in the helimagnetic regime (T &lt; 75 K), the coercive field (HC) of the Fe/MnP sample (HCFe/MnP ~ 1367 Oe) has nearly doubled when compared to the average value of the individual HC of MnP and Fe reference samples (((HCFe + HCMnP)/2) = 780 Oe). Interestingly, the interfacial magnetic coupling strength, defined as ΔHC =|((HCFe + HCMnP)/2) - HCFe/MnP|, decreases significantly with decreasing temperature in the helimagnetic regime. Furthermore, the ratio of remanence magnetization (Mr) to saturation magnetization (Ms) of Fe/MnP is higher than the average value of individual Mr/Ms ratios of MnP and Fe. Overall, the observed shapes of the M-H loops of the Fe/MnP bilayer deviate remarkably from those of the reference samples. Since the exchange bias effect is negligible in the Fe/MnP system, these observations consistently validate the presence of the MPE.

Magnetic proximity effect on the helimagnetic state of highly crystalline manganese phosphide films

Ultra-Short Pulsed Laser Ablation process performed on the surface of a Grain-Oriented Electrical Steel (GOES) has shown a significant decrease in the iron losses up to 20%. This is due to a modification of the domain structure that is re-organized using a total energy minimization. Therefore, this leads to a change in the permeability and in the magneto-mechanical behavior also known as the magnetostriction. These modifications are respectively due to the modification of the magnetostatic and the magnetoelastic energy contributions. In this study, the effect of the ablation on the magnetic and the magneto-mechanical properties is revealed and compared to classical irradiation and scribing processes in the static and the dynamic working conditions. Synchronous real time magnetic and mechanical measurements are performed using a dedicated test bench: the Single Sheet Tester with a mechanical adaptation using a fixed-free sample with a piezoelectric accelerometer. GOES samples are measured and compared before and after treatment for different optimal laser parameters. Results have shown that different performances can be simultaneously obtained: - Magnetostriction reduction up to 50% - Permeability increase at low induction up to 20% Physical origins of the change in both static and dynamic magneto-mechanical properties due a laser process will be discussed and proposed to orientate the optimization of laser process parameters towards the best compromise between iron loss reduction, permeability increase and magnetic induced vibrations.

![](https://assets.underline.io/uploads/markdown_image/1/image/f3a530642ac29649dfcf907edea86602.jpg)

Fig. 1: Peak-to-Peak Magnetostriction: Ref (Blue), ablation 1 (Red), ablation 2 (Black)

Ultra-short Pulsed Laser Ablation Process on a GO FeSi Electrical Single Sheet: Impact on the Static/Dynamic Magneto-mechanical Behavior and Optimization

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Analysis and Experimental Research on High Frequency Magnetic Properties of Different Magnetostrictive Materials Considering Temperature Effect

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