重金属/磁绝缘体双层中的光诱导自旋电流的起源
Hongru Wang1, Jing Meng1, Jianjun Lin1
1Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai, China.
Nature communications
|May 22, 2024
概括
这项研究揭示了W/Y3Fe5O12异质连接中两种类型的光诱导的自旋电流:低光下的自旋光伏效应和高光下的自旋Seebeck效应. 结果提供了对有效信息处理的见解.
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:
- 有效的信息传输需要光诱导的自旋电流更快的响应.
- 了解光诱导自旋电流背后的机制对于开发先进的电子设备至关重要.
研究的目的:
- 系统地探索光照明能量和方向对光诱导的自旋电流的影响.
- 为了分类和阐明W/Y3Fe5O12异质连接中光诱导的自旋电流的独特机制.
主要方法:
- W/Y3Fe5O12异质连接的制造和表征.
- 系统地研究光照明对自旋电流的影响 (能量,方向).
- 在不同的光强度下分析自旋光伏和自旋西贝克效应.
主要成果:
- 确定了两种类型的光诱导自旋电流:光生成的自旋电流 (自旋光伏效应) 在低光强度和光热诱导的自旋电流 (自旋西贝克效应) 在高光强度.
- 证明在低光强度下,由于最小的温度梯度,旋转西贝克效应在低光强度下可以忽略不计.
- 阐明了自旋光伏效应的机制,将光生成的自旋电流归因于Y3Fe5O12中的光子诱导的自旋前行.
结论:
- 在W/Y3Fe5O12异质连接中,光诱导的旋流取决于光强度,表现为不同的现象.
- 由旋转前行驱动的旋转光伏效应在低光条件下占主导地位.
- 这些发现为光诱导的自旋电流的起源提供了基本的见解,为新型的自旋电子应用铺平了道路.
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