通过促进全球反铁磁秩序,在反铁磁铁中增强旋转轨道扭矩:通往节能记忆的路线
Hao-Kai Chang1, Kuan-Yu Chi2, Yu-Lon Lin1
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.
ACS applied materials & interfaces
|November 14, 2024
概括
研究人员发现,氧化物 (NiO) 的全球尼尔顺序提高了旋转轨道扭矩 (SOT) 的效率. 这便于反铁磁 (AFM) 材料中的自旋传输,为节能计算设备铺平了道路.
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:
- 反铁磁体 (AFM) 中的旋转传输和旋转扭矩效应对于旋转磁体至关重要,但由于各种观测,仍然具有挑战性.
- 氧化 (NiO) 是一种AFM材料,实现可控制的全球Neel顺序是理解旋转运输的关键.
研究的目的:
- 调查全球尼尔序列在由旋转轨道扭矩 (SOT) 促进的NiO中的作用.
- 为了检查不同NiO厚度的W/NiO/CoFeB三层中增强的SOT效率.
- 为了确定促进Nel订单和提高SOT效率之间的相关性.
主要方法:
- 制造W/NiO/CoFeB三层,其NiO厚度为1至5纳米.
- 使用旋转轨道扭矩 (SOT) 来重新定位NiO中的Neil顺序.
- 采用X射线磁线性二元化 (XMLD) 谱学进行分析.
- 进行可重写的 Néel 顺序重定向实验.
主要成果:
- 随机定向的Neel顺序在随着NiO的生长过程中导致了自旋吸收,并阻断了自旋传输.
- SOT可以将NiO的尼尔数序重定向为与电流对齐的全局状态,从而减少旋转吸收.
- 通过NiO增强的旋转传输可以提高邻近的CoFeB层中的SOT效率.
- SOT效率增加了4倍以上,用于缓冲式和场式扭矩,使用5纳米的NiO.
结论:
- 全球促进的Neel顺序和NiO中增强的旋转运输之间存在强烈的相关性.
- 在 NiO 中实现全球的 Néel 订单显著提高了 SOT 的效率.
- 这项研究为开发节能的基于AFM的SOT设备提供了一种有希望的方法.
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