在Mott绝缘体Cu中的光诱导的转移稳定隐藏的skyrmion阶段
Benoit Truc1, Alexey A Sapozhnik1, Phoebe Tengdin1
1Laboratory for Ultrafast Microscopy and Electron Scattering, Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland.
研究人员使用激光脉冲在Cu2OSeO3中发现了一种新的,持久的隐藏的 skyrmion 阶段. 这种超稳定的磁性状态,非adiabatically访问,提供了潜在的超快速控制在spintronic设备.
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:
- Skyrmions是拓保护的旋转纹理,在数据存储中具有潜在的应用.
- 多铁材料具有独特的磁电合特性.
- 在超快的时间尺度下控制磁态对于下一代电子设备至关重要.
研究的目的:
- 在Cu2OSeO3.3.中发现和表征一种新型的转移稳定的 skyrmion 阶段.
- 为了研究这种隐藏的磁相的光生成机制.
- 为了评估光诱导 skyrmion 状态的稳定性和潜在应用.
主要方法:
- 洛伦兹传输电子显微镜 (LTEM) 用于可视化天体.
- 使用近红外 femtosecond激光脉冲进行非adiabatic激发.
- 旋转动力学模拟以确定光生成机制.
主要成果:
- 在Cu2OSeO3中发现了一种新的,长期存在的转移稳定的斯基米翁阶段,位于平衡状态的斯基米翁口袋下方.
- 这个隐藏阶段可以通过激光激发来访问,但不能通过传统的场冷却来访问.
- 磁弹性效应被确定为主要的光生成机制,由激光诱导的磁性自由能量景观的短暂修改驱动.
- 光诱导的skyrmion状态表现出超过15分钟的稳定性,这表明实际的长期可行性.
结论:
- 已经展示了一种使用光来访问和稳定 skyrmion 阶段的新方法.
- 这一发现为在超快的时间尺度上按需控制磁态开辟了道路.
- 这种方法对开发低分散的自旋电子设备具有前景.
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