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在Pt/Co/HfO/Ta多层中旋转轨道扭矩的和霍尔测量中平面纳斯特效应的定量分离

Changjin Yun¹, Yonghwan Jo¹, Mingu Kim¹

¹Department of Applied Physics, Korea University, Sejong, 30019, Korea.

Scientific reports

|December 15, 2025

概括

旋转轨道扭矩 (SOT) 对MRAM至关重要,但热效应使其测量变得复杂. 这项研究将Pt/Co/HfO/Ta多层中SOT与热信号分离,显示高电阻样本的阻尼式扭矩增加39%.

科学领域:

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

背景情况:

旋转轨道扭矩 (SOT) 是磁随机存储器 (MRAM) 中高效磁化切换的关键.
重金属的高电阻增强了SOT,但引入了热电器件,使准确的测量变得复杂.
SOT的定量评估受到热信号的阻碍,特别是在具有平面内磁性异构的系统中.

研究的目的:

为了研究Pt/Co/HfO/Ta多层中具有不同Pt层电阻性的SOT.
开发一种方法来将SOT贡献与热电效应分开,例如平面Nernst效应 (PNE).
为了准确量化高电阻自旋电子装置的SOT效率.

主要方法:

使用不同的喷射压力制造Pt/Co/HfO/Ta多层与低电阻和高电阻的Pt层.
在不同的磁场极性和电流条件下测量SOT和第二波信号.
应用基于对称性的分析来区分SOT与平面Nernst效应 (PNE).

主要成果:

高电阻的Pt层产生了增强的减压式扭矩和可观测的第二波信号.
鉴定出第二波信号源于平面Nernst效应 (PNE),因为其具有特征的角度依赖性,电流缩放和信号反转.
在去除热贡献后,对于高电阻样本,观察到缓冲式扭矩增加了约39%.

结论:

开发了一种可靠的技术来将SOT与热效应 (PNE) 分离在具有内平面异构的金属异构结构中.
这种方法可以精确评估和设计基于SOT的自旋电子设备,特别是在高电阻系统中.
这些发现通过提供准确的SOT表征来促进MRAM设备的优化.

关键词:

平面的Nernst效应是一个效应.测量第二和的测量.旋转大厅效应的作用旋转轨道扭矩

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