无场,决定性的巨型旋转轨道扭矩切换1.3 T垂直磁化与对称升起的拓表面状态
He Ren1,2, Yawen Peng1,2, Meixin Cheng1,3
1Institute For Quantum Computing (IQC), University of Waterloo, Waterloo, ON, Canada.
Advanced materials (Deerfield Beach, Fla.)
|December 22, 2025
概括
研究人员使用旋转轨道扭矩 (SOT) 在一种新的异构结构中实现了磁化无场切换. 这一突破利用了拓绝缘体和二维磁铁,为先进的自旋电子设备铺平了道路.
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:
- 使用旋转轨道扭矩 (SOT) 对垂直磁化无场控制对于旋转机内存和逻辑设备至关重要.
- 实现确定性的平面外切换需要打破平面内对称性,这是传统异构结构无法应对的挑战.
研究的目的:
- 为了证明在一个新的异构结构中无场切换,将拓绝缘器与二维磁铁结合起来.
- 调查接口对称性破坏在实现高效SOT切换中的作用.
主要方法:
- 使用自相交接的2D磁铁 (Cr3Te4) 和拓绝缘体 ((Bi0.75Sb0.25) 2Te3) 的异构结构的制造.
- 利用拓绝缘体的表面状态来实现高效的电荷-自旋转换.
- 利用2D磁铁的有序自我插曲来打破平面内对称性并创建单向磁性 (Cs) 对称性.
主要成果:
- 证明了Cr3Te4的强烈的无场SOT切换,具有高垂直强迫力 (≈1.3 T).
- 在SOT切换中观察到三倍的角度依赖,这是由于在晶圆尺度沉积过程中三个相当的2x1子网的核化.
- 展示了拓绝缘体表面状态和接口对称性破坏的协同效应.
结论:
- 开发的异构结构可以实现高效的无场SOT切换,克服传统材料的局限性.
- 这项工作为设计基于拓绝缘体的自旋电子设备提供了一个有前途的策略.
- 这些发现有助于推进下一代自旋电子的材料和设备设计.
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