超薄CoO/Pt接线板的电转换机制
Christin Schmitt1, Adithya Rajan1, Grischa Beneke1
1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany.
Nano letters
|January 12, 2024
概括
电脉冲控制了氧化物/双层中的Neel向量. 开关机制取决于电流密度,通过热磁弹性和旋转轨道扭矩效应导致相反的电阻变化.
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:
- 反铁磁材料为先进的自旋电子设备提供了潜力.
- 了解电流诱导的切换机制对于设备应用至关重要.
研究的目的:
- 调查氧化物/双层中尼尔向量的电流诱导的切换.
- 阐明底层的反铁磁切换机制.
主要方法:
- 在超薄的CoO/Pt双层上进行电脉冲测量.
- 用于域结构成像的X射线磁性线性二元化光发射电子显微镜 (XMLD-PEEM).
- 对自旋霍尔磁阻 (SMR) 信号的分析.
主要成果:
- 同一个路径上的不同电流密度的电脉冲导致SMR信号发生相反的变化.
- 在XMLD-PEEM成像中,在超薄的CoO (4nm) 中发现了明显的Neel向量重定向.
- 空间分辨率成像显示了脉冲和非脉冲区域的不同切换自旋结构.
结论:
- 相反的电阻变化可能来自热磁弹性切换机制.
- 基于旋转轨道扭矩的切换机制可以在非常薄的薄膜中占主导地位,解释观察到的现象.
- 该研究提供了对控制反铁磁顺序的洞察力,用于自旋电子应用.
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