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Optimizing magnetoelastic properties by machine learning and high-throughput micromagnetic simulation

Rare Metals 2024年第5期43卷 2251-2262页

作者： Jian-Hu Gong Zheng-Ming Zhang Cheng-Liang Zhang Peng-Qiang Hu Chao Zhou Dun-Hui Wang Sen Yang Division of Microelectronic Materials and Devices Hangzhou Dianzi University School of Physics MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University National Laboratory of Solid State Microstructures Nanjing University

Magnetoelastic couplings in giant magnetostrictive materials （GMMs） attract significant interests due to their extensive applications in the fields of spintronics and energy harvesting devices.Understanding the role of the selection of materials and the response to external fields is essential for attaining desired functionality of a GMM.Herein,machine learning （ML） models are conducted to predict saturation magnetostrictions （λs） in RFe2-type （R=rare earth） GMMs with different compositions.According to ML-predicted composition–λsrelations,it is discovered that the values ofλshigher than1100×10–6are almost situated in the composition space surrounded by 0.26≤x≤0.60 and 1.90≤y≤2.00 for the ternary compounds of TbxDy1-xFey.Assisted by ML predictions,the compositions are further narrowed down to the space surrounded by 0.26≤x≤0.32 and 1.92≤y≤1.97 for the excellent piezomagnetic （PM） performance in the TbxDy1-xFey-based PM device through our developed high-throughput （HTP） micromagnetic simulation（MMS） algorithm.Accordingly,high sensitivities up to10.22–13.61 m T·MPa–1are observed in the optimized range within which the available experimental data fall well.This work not only provides valuable insights toward understanding the mechanism of magnetoelastic couplings,but also paves the way for designing and optimizing highperformance magnetostrictive materials and PM sensing devices.

关键词： Magnetostriction Piezomagnetic effect Machine learning micromagnetic simulation

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micromagnetic simulation on the dynamic susceptibility spectra of cobalt nanowires arrays:the effect of magnetostatic interaction

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Chinese Physics B 2010年第8期19卷 590-596页

作者：陈文兵韩满贵周浩欧雨邓龙江 State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

micromagnetic simulations have been performed to obtain the dynamic susceptibility spectra of 4×4 cobalt nanowire arrays with different spatial configurations and geometries. The susceptibility spectra of isolated wires have also been simulated for comparison purposes. It is found that the susceptibility spectrum of nanowire array bears a lot of similarities to that of an isolated wire, such as the occurrences of the edge mode and the bulk resonance mode. The simulation results also reveal that the susceptibility spectrum of nanowire array behaves like that of single isolated wire as the interwire distance grows to an extent, which is believed due to the decrease of magnetostatic interaction among nanowires, and can be further confirmed by the static magnetic hysteresis simulations. In comparison with single nanowire, magnetostatic interaction may increase or decrease the resonance frequencies of nanowire arrays assuming a certain interwire distance when the length of array increases. Our simulation results are also analysed by employing the Kittel equation and recent theoretical studies.

关键词： micromagnetic simulation dynamic susceptibility nanowire array magnetostatic interaction

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micromagnetic simulation of Au interlayer in L1_0-FePt nanocomposite recording medium

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Rare Metals 2017年第2期36卷 108-112页

作者： Sa-Zi Li Su-Fen Zhao Yong Xie Zi-Yu Chen Department of Physics Beijing University of Aeronautics and Astronautics Laboratory of Device National Center for Nanoscience and Technology

Owing to the epitaxial inducement of Au atom,Au interlayer was introduced to increase the perpendicular anisotropy and the coercivity in L10-FePt nanocomposite film.micromagnetics can be used to reveal the relationship between microstructure and magnetic properties of materials,and give the information of the perpendicular anisotropy and coercivity.In this work,the effect of the Au interlayer on annealed[Fe（0.5 nm）/Pt（0.5 nm）/Au（d nm）]10 nanocomposite recording medium by a micromagnetic model was studied.The model contains three phases：hard magnetic phase,soft magnetic phase,and nonmagnetic phase.The calculated result shows that perpendicular orientation degree of the texture and proportion of a hard magnetic phase to the total phase in the annealed film are both enhanced by increasing Au interlayer thickness.This result can be conducive to the improvement of the perpendicular anisotropy and the coercivity of the FePt nanocomposite film in the experiments.

关键词： FePt multilayer Magnetic recording materials Perpendicular anisotropy micromagnetic simulation

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micromagnetic simulation of Sm–Co/α-Fe/Sm–Co trilayers with various angles between easy axes and the film plane

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Chinese Physics B 2014年第9期23卷 439-445页

作者：张溪超赵国平夏静岳明袁新红谢林华 College of Physics and Electronic Engineering Sichuan Normal University

Hysteresis loops and energy products have been calculated systematically by a three-dimensional （3D） software OOMMF for Sm-Co/α-Fe/Sm-Co trilayers with various thicknesses and β, where β is the angle between the easy axis and the field applied perpendicular to the film plane. It is found that trilayers with a perpendicular anisotropy possess considerably larger coercivities and smaller remanences and energy products compared with those with an in-plane anisotropy. Increase of β leads to a fast decrease of the maximum energy product as well as the drop of both remanence and coercivity. Such a drop is much faster than that in the single-phased hard material, which can explain the significant discrepancy between the experiment and the theoretical energy products. Some modeling techniques have been utilized with spin check procedures performed, which yield results in good agreement with the one-dimensional （1D） analytical and experimental data, justifying our calculations. Further, the calculated nucleation fields according to the 3D calculations are larger than those based on the 1D model, whereas the corresponding coercivity is smaller, leading to more square hysteresis loops and better agreement between experimental data and the theory.

关键词： micromagnetic simulation hard/soft trilayers hysteresis loops magnetization configuration

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micromagnetic simulation on magnetic properties of Nd2Fe14B/α-Fe nanocomposites with Fe nanowires as the soft phase

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Frontiers of Materials Science 2018年第4期12卷 348-353页

作者： Wei LI Lizhong ZHAO Zhongwu LIU School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

Fe nanowire array with strong shape anisotropy was employed as the soft phase in Nd-Fe-B based nanocomposites. The effects of the Fe nanowire distribution on magnetic properties of the nanocomposites were investigated by micromagnetic simulation. The results indicate that the shape anisotropy of Fe wires added in the same direction as the uniaxial magnetocrystalline anisotropy of the hard phase cannot increase the coercivity of the nanocomposite. When the nanowires are distributed perpendicular to the easy axis of the hard phase, the shape anisotropy of soft phase can retard the moments from rotating to the full reversed direction, leading to enhanced coercivity. In addition, with increasing the nanowire diameter, the coercivity of the nanocomposite decreases, but the dipolar interaction shows different roles in magnetic reversal of nanocomposite for different distributions of nanowires. The current results suggest that the coercivity of the Nd2Fe14B/α-Fe nanocomposite can be enhanced by introducing the soft magnetic nanowire array with the diameter less than the exchange length and with the long axis along the direction other than the easy axis of hard phase.

关键词： Nd 2 Fe 14 B/α-Fe nanocomposite micromagnetic simulation Fe nanowires shape anisotropy exchange coupling

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Consistency between domain wall oscillation modes and spin wave modes in nanostrips

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Chinese Physics B 2024年第6期33卷 511-516页

作者：董新伟吴振江 Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen UniversityXiamen 361005China

Investigations on domain wall(DW) and spin wave(SW) modes in a series of nanostrips with different widths and thicknesses have been carried out using micromagnetic simulation. The simulation results show that the frequencies of SW modes and the corresponding DW modes are consistent with each other if they have the same node number along the width direction. This consistency is more pronounced in wide and thin nanostrips, favoring the DW motion driven by SWs.Further analysis of the moving behavior of a DW driven by SWs is also carried out. The average DW speed can reach a larger value of ~ 140 m/s under two different SW sources. We argue that this study is very meaningful for the potential application of DW motion driven by SWs.

关键词： micromagnetic simulation domain wall spin wave

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micromagnetic simulation for high field sensors with perpendicular magnetizations

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Chinese Physics B 2007年第6期16卷 1731-1735页

作者：金伟刘要稳 Department of Physics Tongji University Shanghai 200092 China College of Physics and Communication Electronics Anhui Normal University Wuhu 241000 China

In this paper, we present a micromagnetic design for high field sensors. The hard layer of the sensors is L10-FePt which is magnetized perpendicularly to film plane and the sense layer is NiFe which is magnetized in the film plane. The magnetization configurations of the hard and sense layers at different external magnetic fields have been simulated. In micromagnetic simulation, the sense field up to one tesla can be reached by using this sensor. We find that whether the sensor has a symmetric or an asymmetric field-sensing window is determined by the coercive field of the hard layer and the demagnetizing field of the sense layer.

关键词： micromagnetic simulation giant magnetoresistive coercivity demagnetizing field

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Investigation of L1_0 FePt-based soft/hard composite bit-patterned media by micromagnetic simulation

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Chinese Physics B 2015年第6期24卷 662-667页

作者：王颖韦丹曹江伟魏福林 Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua University

The soft/hard composite patterned media have potential to be the next generation of magnetic recording, but the composing modes of soft and hard materials have not been investigated systematically. L10 FePt-based soft/hard composite patterned media with an anisotropic constant distribution are studied by micromagnetic simulation. Square arrays and hexagonal arrays with various pitch sizes are simulated for two composing types： the soft layer that encloses the hard dots and the soft layer that covers the whole surface. It is found that the soft material can reduce the switching fields of bits effectively for all models. Compared with the first type, the second type of models possess low switching fields, narrow switching field distributions, and high gain factors due to the introduction of inter-bit exchange coupling. Furthermore, the readout waveforms of the second type are not deteriorated by the inter-bit soft layers. Since the recording density of hexagonal arrays are higher than that of square arrays with the same center-to-center distances, the readout waveforrns of hexagonal arrays are a little worse, although other simulation results are similar for these two arrays.

关键词： micromagnetic simulation composite bit patterned media L10 FePt switching field distribution,readout signal

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Effects of notches on the order of flux-closure state formation in bi-rings by micromagnetic simulation

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Chinese Physics B 2011年第12期20卷 421-425页

作者：何淑婷常双全史慧刚 Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University

The effects of the number and the location of notches on the formation of flux-closure states in bi-rings with fields applied in the x direction （i.e., along the short axis direction of hi-rings） and y direction （i.e., along the long axis direction of bi-rings） are investigated using micromagnetic simulation. For the bi-rings with one notch and the bi-rings with two notches symmetric about y axis, the order of flux-closure state formation in each ring can be controlled. But the flux-closure state forms simultaneously in each ring for the bi-rings with two notches symmetric about x axis. For the bi-rings with two notches that are symmetric neither about x axis nor about y axis, only one ring can form a flux- closure state in the y-direction field and no fluxclosure state can be found in rings in the x-direction field. Therefore, logic states can be defined by controlling the order of flux-closure state formation, which can be utilized in future logic devices.

关键词： notch（es） the order flux-closure state formation micromagnetic simulation

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Tailoring coercive field in rare earth giant magnetostrictive materials byα-Fe precipitation

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Rare Metals 2023年第2期42卷 606-613页

作者： Fang-Xian Zhang Peng-Qiang Hu Zheng-Ming Zhang Jian-Hu Gong Dun-Hui Wang Division of Microelectronic Materials and Devices Hangzhou Dianzi UniversityHangzhou310018China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China

Rare earth giant magnetostrictive materials(GMMs)Tb_(1-x)Dy_(x)Fe_(2±δ)(Tb-Dy-Fe)have been successfully employed in many microelectromechanical devices due to their excellent magnetostrictive properties at room temperature.However,Tb-Dy-Fe still shows a relatively large coercivity with high hysteresis,which inevitably limits its application range.Herein,micromagnetic simulations are performed to investigate the size effect of precipitated phase(α-Fe)on coercivity in Tb-Dy-Fe.simulation results demonstrate that the coercivity is reduced from 31.46 to 12.48 mT with increasing the size ofα-Fe from 4 to 50 nm in Tb-Dy-Fe since the precipitated phase ofα-Fe can act as a magnetization reversal nucleus.This decreasing trend of coercivity can be well fitted with an inverse square relationship,which agrees well with the nucleation theory.Our study highlights that the coercivity of Tb-Dy-Fe can be tailored by tuning the size ofα-Fe precipitation.

关键词： Giant magnetostrictive material(GMM) Precipitation Coercivity micromagnetic simulation

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