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arXiv 2601.16633cond-mat.mes-hall
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在偶极耦合纳米磁体对和人工自旋冰中电流诱导的磁化控制

Current-induced magnetization control in dipolar-coupled nanomagnet pairs and artificial spin ice

ETH Zurich(苏黎世联邦理工学院);PSI Center for Neutron and Muon Sciences(保罗谢尔研究所中子与μ子科学中心);University of Salamanca(萨拉曼卡大学);Universidad de Salamanca(萨拉曼卡大学)

A. Pac, G. M. Macauley, J. A. Brock, A. Hrabec, A. Kurenkov, V. Raposo, E. Martinez, L. J. Heyderman

AI总结:

研究通过电流诱导自旋轨道扭矩控制纳米磁体磁化方向,揭示电流方向与磁体取向关系对切换阈值的影响,为可编程磁控提供新方法。

摘要:

利用电流诱导的自旋轨道扭矩(SOTs)来操控具有平面磁各向异性(如人工自旋冰)的偶极耦合纳米磁体系统,提供了一种实现局部、电可编程磁化控制的途径,对神经形态计算等应用具有相关性。本文展示了纳米磁体相对于所施加电流方向的取向如何影响所有电气磁化切换所需的阈值电流密度,以及偶极耦合如何影响相互作用对和纳米磁体集合的切换。使用一种能够对电流传导产生SOTs的材料系统,我们发现孤立纳米磁体的磁化切换所需的电流随纳米磁体长轴与电流方向之间的角度非单调变化。在小规模人工自旋冰系统中,我们观察到类似的角依赖性切换电流,可用于控制特定子集纳米磁体的磁化取向。这些实验结果得到了微磁学建模的支持,说明如何利用各种电流诱导扭矩来控制纳米磁体系统的磁化切换。这些结果确立了SOT切换作为可编程操控偶极纳米磁体系统的实用方法。

英文摘要:

Exploiting current-induced spin-orbit torques (SOTs) to manipulate the magnetic state of dipolar-coupled nanomagnet systems with in-plane magnetic anisotropy, such as artificial spin ices, provides a route to local, electrically-programmable control of the magnetization, with relevance for applications including neuromorphic computing. Here, we demonstrate how the orientation of a nanomagnet relative to the direction of an applied electrical current impacts the threshold current density needed for all-electrical magnetization switching, and how dipolar coupling between the nanomagnets influences the switching of interacting pairs and ensembles of nanomagnets. Using a material system designed to generate SOTs in response to electrical currents, we find that the current required to switch the magnetization of isolated nanomagnets varies non-monotonically as the angle between the nanomagnet long axis and the current increases. In small artificial spin ice systems, we observe similar angular dependence of the switching current, which can be used to control the magnetization orientation of specific subsets of nanomagnets. These experimental results are supported by micromagnetic modeling, which illustrates how the various current induced torques can be exploited to control magnetization switching in nanomagnetic systems. These results establish SOT switching as a practical method for programmable manipulation of dipolar nanomagnetic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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