UK-Japanese Collaboration on Current-Driven Domain Wall Dynamics

英日在电流驱动畴壁动力学方面的合作

• 批准号: EP/J000337/1
• 负责人: Christopher Marrows
• 金额: $ 10.1万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FJ000337%2F1
• 关键词: UK; Japanese; Collaboration; Current; Driven

The project will be a collaboration between theory (Japan) and experiment (UK). The effort of this project will be directed into study of the role of the spin-orbit interaction in current-driven spin torques in magnetic nanowires. Here we will tackle two main areas. The first is the use of spin-orbit coupling to induce spin-flip scattering and hence increase the so-called non-adiabatic (beta term) torque, which is field-like in symmetry. The second is to study the use of spin orbit coupling to introduce a current-dependent effective magnetic field through the Rashba effect. Both of these are outstanding mysteries of condensed matter physics, in that there is no predictive theory to allow materials and devices with appropriate parameters to be designed. They may also hold the key to the substantially more efficient spin-torques that will allow for lower power device operation. The project builds on existing programmes in the UK and Japan, in particular "Current-Driven Domain Wall Motion in Multilayer Nanowires" EPSRC grant EP/I011668/1 held by Dr Marrows and "Microscopic theory of spin transports", a JSPS Grant-in-Aid for Scientific Research (B) (Grant No. 22340104) held by Prof. Tatara. There is a natural complementarity between the experimental programme in the former and the programme of analytical and first-principles theory in the latter.

该项目将是理论（日本）和实验（英国）之间的合作。该项目将致力于研究自旋轨道相互作用在磁性纳米线中电流驱动的自旋扭矩中的作用。在这里，我们将解决两个主要领域。第一个是使用自旋轨道耦合来引起自旋翻转散射，从而增加所谓的非绝热（β项）扭矩，其对称性类似于场。二是研究利用自旋轨道耦合，通过Rashba效应引入电流相关的有效磁场。这两者都是凝聚态物理学的未解之谜，因为没有预测理论可以设计具有适当参数的材料和设备。它们还可能掌握着大幅提高自旋扭矩的关键，从而实现更低功率的器件运行。该项目建立在英国和日本现有项目的基础上，特别是由 Marrows 博士持有的“多层纳米线中的电流驱动域壁运动”EPSRC 拨款 EP/I011668/1 和“自旋传输的微观理论”（JSPS 拨款） -Tatara教授持有的科学研究援助（B）（授权号22340104）。前者的实验计划与后者的分析和第一原理理论计划之间存在着天然的互补性。

项目成果

Spin-orbit interaction enhancement in permalloy thin films by Pt doping

• DOI: 10.1103/physrevb.93.014432
• 发表时间: 2016-01
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: A. Hrabec;F. Goncalves;C. S. Spencer;E. Arenholz;A. N’Diaye;R. Stamps;C. Marrows

Current-driven dynamics of coupled domain walls in a synthetic antiferromagnet

• DOI: 10.1103/physrevb.90.094411
• 发表时间: 2014-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: H. Saarikoski;H. Kohno;C. Marrows;G. Tatara

Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion.

• DOI: 10.1038/s41598-017-01748-7
• 发表时间: 2017-05-09
• 期刊: Scientific reports
• 影响因子: 4.6
• 作者: Lepadatu S;Saarikoski H;Beacham R;Benitez MJ;Moore TA;Burnell G;Sugimoto S;Yesudas D;Wheeler MC;Miguel J;Dhesi SS;McGrouther D;McVitie S;Tatara G;Marrows CH
• 通讯作者: Marrows CH