范德瓦尔斯铁磁FePd2Te2/Pt异构结构中的增强THz排放和性控制
Jiali Zhang1, Bingxian Shi2,3, Haoran Xu4
1Key Laboratory of Micro and Nano Photonic Structures (MOE), School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Journal of the American Chemical Society
|May 27, 2025
概括
两个维的磁性材料显示了回旋电子的前景. 用覆盖FePd2Te2可通过旋转到电荷转换显著增强特拉赫兹辐射,为先进的旋转器件铺平了道路.
科学领域:
- 凝聚物质物理学
- 材料科学
- 机器人
背景情况:
- 二维 (2D) 范德瓦尔斯 (vdW) 磁性材料为旋转应用提供了独特的特性.
- 特拉赫兹 (THz) 发射器对于先进的电子设备至关重要.
- FePd2Te2是一种新发现的vdW铁磁体,具有1D Fe 晶圆链结构和内平面无轴异体性.
研究的目的:
- 研究vdW铁磁铁FePd2Te2的THz辐射特性.
- 探索 (Pt) 限制层对THz排放的影响.
- 了解FePd2Te2/Pt异构中光激发自旋电流产生背后的机制.
主要方法:
- 使用超快速反射THz发射光谱 (TES).
- 在原始FePd2Te2和3纳米Pt封顶的FePd2Te2上进行了实验.
- 分析包括改变激光极化角度.
主要成果:
- 在室温下表现出微弱的THz发射.
- FePd2Te2/Pt异构显示出显著增强的THz排放强度.
- 通过反旋霍尔效应 (ISHE) 将增强的排放归因于旋转为电荷转换 (SCC).
- 子发射强度与晶体结合和激光极化所产生的自旋纹理相关.
- 确定了两个自旋电流生成机制:热电子和诱导磁化的非线性光学效应.
结论:
- 上限增加了FePd2Te2通过ISHE的THz排放.
- 晶体结合和非线性光学效应在旋转动力学中起着关键作用.
- 这些发现有助于开发使用2D vdW磁铁的高密度,低功率THz旋转器件.
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