基于二维1T-VSe2和旋转对齐的h-BN单层的范德瓦尔斯磁接
Qiaoxuan Zhang1,2, Cong Wang3, Wenjie Wang4
1Department of Electrical Engineering and Automation, Hebei University of Water Resources and Electric Engineering, Cangzhou 061001, China.
Nanomaterials (Basel, Switzerland)
|August 27, 2025
概括
在范德瓦尔斯磁结 (MTJ) 中扭转六角化物 (h-BN) 绝缘层会大大改变它们的性能. 这种扭转角度工程允许对旋转器件中道磁阻 (TMR) 的比率进行显著控制.
科学领域:
- 机器人
- 材料科学
- 凝聚物质物理学
背景情况:
- 磁道连接 (MTJ) 对于磁随机访问存储器 (MRAM) 和传感器等旋转器件至关重要.
- 二维 (2D) 范德瓦尔斯 (vdW) 异构结构为先进的MTJ提供了一个可扩展的平台.
- 在VDW异构结构中,扭曲角度工程使电子和磁性性能能够微调.
研究的目的:
- 调查六角化物 (h-BN) 绝缘层对VDWMTJ性能的影响.
- 确定h-BN屏障的旋转对齐与道磁阻 (TMR) 的比率之间的关系.
- 探索对转角度依赖的传输特性负责的基本机制.
主要方法:
- 使用基于密度函数理论 (DFT) 的第一原理计算.
- 使用非平衡格林函数 (NEGF) 形式来计算自旋依赖的传输特性.
- 系统地分析了h-BN层在石墨烯/1T-VSe2/h-BN/1T-VSe2/石墨烯异构结构中的18个不同的旋转对齐.
主要成果:
- 在TMR比率中观察到显著的,取决于轮转的变化,范围从2328%到24,608%.
- 在52.4°的扭转角附近确定了最大的TMR比率.
- 发现扭曲角度调节了交界V原子的d-轨道电子状态,并改变了费米水平的旋转极化.
结论:
- 旋转h-BN层是一种有效的策略,用于设计VDWMTJ中的TMR比率.
- 这项研究展示了一种通过精确控制层间扭转角度来优化旋转器件性能的新方法.
- 这项工作为设计使用2D vdW材料的高性能旋转应用开辟了新的途径.
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