超快速时间解析的非热电流诱导的反铁磁维尔半金属切换的观测
Kazuma Ogawa1, Hanshen Tsai2, Naotaka Yoshikawa2
1Department of Physics, The University of Tokyo, Bunkyo-ku, Japan. ogawa@thz.phys.s.u-tokyo.ac.jp.
Nature materials
|December 4, 2025
概括
研究人员探索了抗铁磁维尔半金属Mn3Sn.的超快切换. 他们发现了两种不同的开关模式,一种非热式,一种温度辅助式,为更快的磁记录设备铺平了道路.
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:
- 反铁磁铁对下一代自旋电磁器来说是有希望的.
- 作为一种反铁磁韦尔半金属的Mn3Sn,由于其非线性自旋结构,具有独特的室温性能.
- 像Mn3Sn这样的反铁磁体中的超快切换机制尚未完全理解.
研究的目的:
- 为了研究多晶 Mn3Sn 薄膜中超快电流诱导的切换动态.
- 阐明控制这种切换行为的潜在机制.
- 评估Mn3Sn在超快磁记录方面的潜力.
主要方法:
- 使用了超快的磁光克尔效应 (MOKE) 成像.
- 使用的短电流脉冲下降到140皮秒.
- 分析了时空空间解决的切换动态.
主要成果:
- 在Mn3Sn.中确定了两个不同的电流诱导的切换模式.
- 证明了独立于磁性顺序化的非热切换过程.
- 展示了一个温度辅助的切换过程,需要加热高于磁性订单温度.
结论:
- 这项研究揭示了Mn3Sn.中超快磁切换的独特途径.
- 研究结果表明,Mn3Sn是开发超快磁记录技术的可行候选者.
- 了解这些切换动态对于推进自旋电子应用至关重要.
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