范德瓦尔斯磁铁中的异常非线性磁导率 CrSBr
Junhyeon Jo1, Manuel Suárez-Rodríguez1, Samuel Mañas-Valero2
1CIC nanoGUNE BRTA, Donostia-San Sebastián, 20018, Spain.
Advanced materials (Deerfield Beach, Fla.)
|March 10, 2025
概括
研究人员报告了磁性异构结构中的异常非线性磁导率 (NLMC). 这种可以通过磁顺序切换的新型反应,为先进的电子设备和磁状态读取提供了潜力.
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:
- 非线性磁导性 (NLMC) 是一种在缺乏反向对称性的材料中观察到的传输现象.
- 传统的NLMC信号通常在零磁场时为零,这限制了其实际应用.
- 在零磁场下开发可控制和可观测的NLMC现象对于新设备的功能至关重要.
研究的目的:
- 为了研究由内部磁性顺序参数控制的异常非线性磁导率 (NLMC).
- 探索人造范德瓦尔斯异构结构在实现新型磁传输现象方面的潜力.
- 为了证明磁性可切换和增强的NLMC响应,用于高频电子和磁传感的潜在应用.
主要方法:
- 使用磁性CrSBr和绝缘六角化 (hBN) 制造范德瓦尔斯异构结构.
- 在CrSBr的铁磁和反铁磁状态下对非线性磁导率 (NLMC) 的实验测量.
- 导电性缩放分析以阐明潜在的物理机制,确定贝里连接的极化性.
主要成果:
- 在CrSBr/hBN异构结构中通过磁化和Neel向量控制异常NLMC信号的观测.
- 非互惠信号表现出可调节状态 (单层中的两个,双层中的四个CrSBr) 与超磁性过渡相关.
- 与之前的报道相比,NLMC信号显著增强,铁磁状态高出3个数量级,反铁磁状态高出1个数量级.
- 鉴定贝里连接的极化性作为观察到的异常NLMC的起源.
结论:
- 该研究表明,通过控制磁顺序,在零磁场下实现大,可切换的异常非线性磁导率 (NLMC) 的新途径.
- 这些发现为开发具有磁调节输出极性的整流器等高频电子设备开辟了道路.
- 结果还使磁状态的有效电读取成为可能,特别是对于反铁磁材料.
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