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在Ni/Pt支柱中观察远程电流诱导的扭矩

Hiroyuki Moriya¹, Mari Taniguchi¹, Daegeun Jo²

¹Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.

|May 23, 2024

概括

旋转电子中的电流诱导的扭矩通常是短距离的. 这项研究揭示了Ni/Pt双层中的远程扭矩,这表明轨道霍尔效应,而不是旋转霍尔效应,主导扭矩生成.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
这就是Spintronics.

背景情况:

电流诱导的扭矩对于自旋电子应用至关重要.
(Pt) 的旋转霍尔效应通常将扭矩生成限制在短范围 (~1 nm).

研究的目的:

研究 (Ni) /Pt双层中电流诱导的扭矩的机制和范围.
为了确定观察到的扭矩是否偏离了传统的旋转霍尔效应行为.

主要方法:

制造和表征Ni/Pt双层设备.
测量电流诱导的扭矩效率作为 Pt 和 Ni 层厚度的函数.
使用半现实的紧密结合模型进行理论计算.

主要成果:

与典型的基于Pt的系统相比,在Ni/Pt双层中观察到明显更长范围的电流诱导扭矩.
证明扭矩效率随着Pt厚度的增加而增加,甚至超过10nm.
随着Ni厚度的增加,显示出增强的扭矩效率,与旋转霍尔效应的主导地位相矛盾.

结论:

这些发现表明,观察到的远程电流诱导的扭矩并非主要是由于Pt.的旋转霍尔效应.
结果表明Pt中的轨道霍尔效应是Ni/Pt双层中长距离扭矩产生的主导机制.
这项工作开辟了新途径,用于工程长距离旋转扭矩在spintronic设备.

关键词:

轨道上的霍尔效应.轨道电子公司的轨道电子.旋转的霍尔效应旋转电子技术 (spintronics) 是一个技术.旋转-轨道扭矩

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