通过范德瓦尔斯间隙工程在2D铁磁铁Fe4GeTe2中的磁性异性变化调制
Weiran Xie1, Guodong Wei1,2, Tong Zhao3
1Fert Beijing Institute, School of Integrated Circuit Science and Engineering, Beihang University, Beijing, 100191, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 12, 2025
概括
2D铁磁材料 (2D FMs) 的接口工程可以增强磁性异性质. 将Fe4GeTe2薄膜中的范德瓦尔斯 (vdW) 间隙扩大为Al2O3可以抑制垂直异构,从而使新的旋转器件设计成为可能.
科学领域:
- 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
- 纳米技术 纳米技术
背景情况:
- 磁性异构度调制对于自旋电子应用至关重要.
- 二维铁磁材料 (2D FM) 为磁控提供可调节的特性.
- 2D FM 中的范德瓦尔斯 (vdW) 差距是一个有希望的,但对于异性质调制的理解不佳的领域.
研究的目的:
- 为了研究表轴生长对2D FMs的vdW间隙和磁性异构性的影响.
- 阐明介面诱导的磁性异性变化背后的微观机制.
- 探索接口间隙工程作为定制2DFM磁性特性的策略.
主要方法:
- 在Fe4GeTe2.2上α-Al2O3的长轴生长.
- 使用先进技术对VDW间隙扩张的描述.
- 实验和理论分析磁性异构性和旋转重定向温度 (TSR).
主要成果:
- 在α-Al2O3/Fe4GeTe2接口上,表轴增长引发了显著的vdW间隙扩张 (高达0.51 Å).
- 这种扩张强大增强了平面内磁性异构性 (IMA) 并从288K抑制了TSR.
- 观察到的行为与传统的厚度依赖垂直磁性不均性 (PMA) 相反.
结论:
- 接口间隙工程是一种新且有效的方法,用于调整2DFM中的磁性异构性.
- vdW间隙扩张减少了轨道重叠,减少了PMA.
- 这些发现推动了利用二维FM的下一代自旋电子设备的设计原则.
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