末端形状对NiFe纳米薄膜磁反转动力学特性的影响

doi:10.19596/j.cnki.1001-246x.7655

计算物理 ›› 2018, Vol. 35 ›› Issue (3): 373-378.DOI: 10.19596/j.cnki.1001-246x.7655

• • 上一篇

末端形状对NiFe纳米薄膜磁反转动力学特性的影响

张光富^1,2, 邓杨保¹, 田野¹, 蒋练军¹

1. 湖南城市学院信息与电子工程学院, 湖南益阳 413000;
2. 中南大学物理与电子学院, 湖南长沙 410083

收稿日期:2017-03-13 修回日期:2017-04-20 出版日期:2018-05-25 发布日期:2018-05-25
作者简介:张光富(1981-),男,副教授,博士,主要从事磁纳米结构材料性能研究,E-mail:zhanggf@csu.edu.cn
基金资助:
国家自然科学基金（11547186，11604091）及湖南省教育厅科学研究优秀青年基金（16B048）资助项目

Effect of End Shape on Magnetization Reversal Dynamics of NiFe Nanofilm Elements

ZHANG Guangfu^1,2, DENG Yangbao¹, TIAN Ye¹, JIANG Lianjun¹

1. School of information and Electronic Engineering, Hunan City University, Yiyang 413000, China;
2. School of Physics and Electronics, Central South University, Changsha 410083, China

Received:2017-03-13 Revised:2017-04-20 Online:2018-05-25 Published:2018-05-25

摘要/Abstract

摘要： 基于微磁学模拟方法研究末端形状对NiFe纳米薄膜的磁反转和自旋波本征动力学特性的调制及磁反转与自旋波模式软化间的内在联系.纳米薄膜微磁结构的相变总是伴随着某种自旋波模式的软化，软化自旋波模式空间分布预示微磁结构相变的路径.存在一临界裁剪度（h₀）.当裁剪度h<h₀时，磁振荡局域于末端边缘的EM自旋波软化诱导磁反转从磁体末端边缘磁矩失稳开始，边缘失稳区域向中央扩展形成反转畴，最后反转畴逐渐移出膜面外而实现反转.当h≥h₀时，形状各向异性导致边缘局域化模式自旋波被抑制，反转场附近一致模式自旋波的软化诱导磁体一致反转.

关键词: 自旋波, 磁反转, 微磁学模拟, NiFe纳米薄膜

Abstract: Magnetization reversal dynamics of NiFe nanofilm elements were studied with micromagnetic simulation. Magnetization reversal and spin-wave dynamic properties are effectively tuned by tailoring end shape of NiFe nanofilm elements. As magnetization reversal occurs,it is accompanied by a soft magnetic mode whose spacial symmetry determines initial steps(onset) of microscopic magnetization phase transitions path. There exists a critical tapered parameter h₀. For elements with tapering parameter h<h₀, reversal is achieved by nucleation of reversed domain at element ends and its irreversible expansion through domain wall movement toward central area of element. It is softening of edge mode that triggers magnetization reversal. For elements with h ≥ h₀, reversal is realized by quasi-uniform rotation of magnetization, which is induced by softening of fundamental mode.>

Key words: spin wave, magnetization reversal, micromagnetic simulation, NiFe nanofilm

中图分类号:

O482.51

张光富, 邓杨保, 田野, 蒋练军. 末端形状对NiFe纳米薄膜磁反转动力学特性的影响[J]. 计算物理, 2018, 35(3): 373-378.

ZHANG Guangfu, DENG Yangbao, TIAN Ye, JIANG Lianjun. Effect of End Shape on Magnetization Reversal Dynamics of NiFe Nanofilm Elements[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2018, 35(3): 373-378.

参考文献

[1] LAVRIJSEN R, LEE J H, PACHECO A F, et al. Magnetic ratchet for three-dimensional spintronic memory and logic[J]. Nature, 2013, 493(7434):647.
[2] 吕刚,曹学成,张红,等. 磁涡旋极性翻转的局域能量[J]. 物理学报, 2016, 65(21):217503.
[3] LI M, SU Y C, HU J G. Boundary effects in magnetization reversal of micro-square ferromagnetic thin films[J]. Chinese Journal of Computational Physics, 2012, 29(2):285-290.
[4] HU J M, YANG T N, WANG J J, et al. Purely electric-field-driven perpendicular magnetization reversal[J]. Nano Letters, 2015,15(1):616-622.
[5] FERNANDO P, RODOLFO D S, GABRIEL C, et al. Spin reorientation, magnetization reversal, and negative thermal expansion observed in RFe_0.5Cr_0.5O₃ perovskites (R=Lu,Yb,Tm)[J]. Physical Review B, 2016, 94:134402.
[6] NOZAKI Y,KASAI S. Microwave-assisted magnetization reversal in exchange-coupled composite media using linearly polarized microwave fields[J]. IEEE Transactions on Magnetics, 2016, 52(2):1-7.
[7] MONTONCELLO F, GIOVANNINI L, FARMER B, et al. Dynamic origin of segment magnetization reversal in thin-film penrose tilings[J]. Journal of Magnetism and Magnetic Materials, 2016, 423:158-163.
[8] TRVTZSCHLER J, SENTOSUN K, MOZOONI B, et al. Magnetic domain wall gratings for magnetization reversal tuning and confined dynamic mode localization[J]. Scientific Reports, 2016, 6:30761.
[9] SIDDHARTH R, JAN R, ANDRE B, et al. Time-resolved imaging of pulse induced magnetization reversal with a microwave assist field[J]. Scientific Reports, 2015, 5(3):471-485.
[10] MONTONCELLO F, GIOVANNINI L, NIZZOLI F. et al. Dynamic origin of first and second order phase transitions in magnetization reversal of elliptical nanodots[J]. Physical Review B, 2008, 77(21):214402.
[11] MAXIM S, ALEXEY O, ALEXANDER S, et al. Influence of the properties of soft collective spin wave modes on the magnetization reversal in finite arrays of dipolarly coupled magnetic dots[J]. Journal of Magnetism and Magnetic Materials, 2015, 384:166-174.
[12] YANN G, JUN Y, ARON P, et al. Soft spin wave near v=1:Evidence for a magnetic instability in skyrmion systems[J]. Physical Review Letters, 2008,100(8):086806.
[13] ESCOBARA R A, LAGEB E, D'ALBUQUERQUE E CASTRO J, et al. Geometry dependence of the magnetization reversal process in bridged dots[J]. Journal of Magnetism and Magnetic Materials, 2017,432:304-308.
[14] GOPMAN D B, KABANOV Y P, CUI J, et al. Influence of internal geometry on magnetization reversal in asymmetric permalloy rings[J]. Applied Physics Letters, 2016, 109(8):082407.
[15] NTALLIS N, EFTHIMIADIS K G. Size dependence of the magnetization reversal in a ferromagnetic particle[J]. Computational Materials Science, 2015, 99:373-380.
[16] SCHREF T, FIDLER J, CHAPMAN J N, et al. Micromagnetic simulation of domain structures in patterned magnetic tunnel junctions[J]. Journal of Applied Physics, 2001, 89(11):7000-7002.
[17] HAN X F, GRIMSDITCH M, MEERSSCHAUT J, et al. Magnetic instability regions in patterned structures:Influence of element shape on magnetization reversal dynamics[J]. Physical Review Letters, 2007,98(14):147202.
[18] HONG Y, ZHAO L Z, WANG G, et al. Micromagnetic simulation of magnetization reversal process using magnetic force microscope image[J]. IEEE Transactions on Magnetics, 2015, 51(11):7100304.
[19] SLAWOMIR ZIęTEK,JAKUB CHęCIńSKI,M FRANKOWSKI, et al. Electric-field tunable spin waves in PMN-PT/NiFe heterostructure:Experiment and micromagnetic simulations[J]. Journal of Magnetism & Magnetic Materials, 2017, 428:64-69.
[20] DONHUE M J, PORTER D G. OOMMF User's Guide, Version 1.2b0[CP/OL]. http://math.nist.gov/oommf/[2016-09-30].
[21] C. BAYER, J. JORZICK, B. HILLEBRANDS, et al. Spin-wave excitations in finite rectangular elements of Ni₈₀Fe₂₀[J]. Physical Review B, 2005, 72(6):064427.
[22] ZHANG G F, LI Z X, WANG X G, et al. Shape-manipulated spin-wave eigenmodes of magnetic nanoelements[J]. Chinese Physics B, 2015, 24(9):097503.Received date:2017-03-13; Revised date:2017-04-20

末端形状对NiFe纳米薄膜磁反转动力学特性的影响

Effect of End Shape on Magnetization Reversal Dynamics of NiFe Nanofilm Elements

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