Optimization of Spin-Polarized Current Induced Domain Wall Velocity in a Magnetic Nano Stripe Using Sinc Pulse—A Computational Study

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER
Madhurima Sen, Saswati Barman
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Abstract

Domain wall propagation and domain wall structure in spin dynamics play a crucial role in the development of new efficient memory devices. A transverse domain wall in the finite straight permalloy nanostrip has been investigated by applying the different normalized sinc current pulses and observing its motion. In addition, it has been observed that domain wall velocity gradually increases with the increase of the pulse period of the sinc pulse current. Furthermore, the pulse scale plays another crucial role in improving the domain wall velocity. Domain Wall velocity can be increased again by changing the non-adiabatic parameter. This study has successfully found the optimal values of the non-adiabatic parameter β and a scaler factor k that can be multiplied to pulse scale resulting in the highest domain wall velocity in particularly low current. It significantly established another control mechanism on the domain wall by varying the pulse scale and pulse period of the sinc pulse current. The present work shows that domain wall motion inside magnetic nano strips may be controlled with high efficiency and reliability using spin-polarized current pulse by solving the LLG equation and the object oriented micromagnetic framework (OOMMF) simulator. The development of racetrack memory technologies with enhanced data storing capacity will be significantly impacted by this study.

Abstract Image

Abstract Image

利用 Sinc 脉冲优化磁性纳米条纹中自旋极化电流诱导的畴壁速度--计算研究
摘要 自旋动力学中的畴壁传播和畴壁结构对新型高效存储器件的开发起着至关重要的作用。通过施加不同的归一化 sinc 电流脉冲并观察其运动,研究了有限直直的 permalloy 纳米带中的横向畴壁。此外,还观察到畴壁速度随着 sinc 脉冲电流脉冲周期的增加而逐渐增加。此外,脉冲尺度在提高域壁速度方面也起着至关重要的作用。通过改变非绝热参数,可以再次提高域壁速度。这项研究成功地找到了非绝热参数 β 的最佳值,以及与脉冲尺度相乘的标度因子 k,从而在特别小的电流下获得最高的域壁速度。通过改变 sinc 脉冲电流的脉冲尺度和脉冲周期,它极大地建立了对畴壁的另一种控制机制。本研究表明,通过求解 LLG 方程和面向对象的微磁框架(OOMMF)模拟器,利用自旋极化电流脉冲可以高效、可靠地控制磁性纳米带内部的畴壁运动。这项研究将极大地推动数据存储能力更强的赛道存储器技术的发展。
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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
期刊介绍: Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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