Co2FeAl合金薄膜在垂直外磁场下的超快自旋动力学
Ultrafast spin dynamics in Co2FeAl alloy film under perpendicular external magnetic field
袁启弘 1周洁林 1黄汉山 1梁宇翔 1陈桂才 1陈志峰1
作者信息
- 1. 广州大学物理与材料科学学院,广东广州 510006
- 折叠
摘要
文章通过使用时间分辨磁光克尔光谱技术研究了 Co2FeAl赫斯勒合金薄膜在施加垂直外磁场下的激光诱导超快自旋动力学.实验结果表明,在严格垂直外磁场下同时激发出表面波模和驻波模两种自旋波模式,且均呈现出自旋波频率随磁场增大而减小的特殊现象.此外,通过衰减特性研究发现,驻波模的磁阻尼因子与外磁场并无明显依赖关系,而表面波模的磁阻尼随磁场增大而增大.通过分析表面波模的群速度讨论了该模式磁阻尼外场依赖特性的成因.实验揭示了钴基赫斯勒合金薄膜在严格垂直外磁场下的自旋波动力学性质,对于推进该类材料在新一代自旋电子器件中的应用具有积极意义.
Abstract
This study investigated the laser-induced ultrafast spin dynamics of Co2FeAl Heusler alloy film under a perpendicular external magnetic field by using the time-resolved magneto-optical Kerr spectroscopy technique.The experimental results indicate that two spin-wave modes,the surface wave mode and the standing wave mode,are excited simultaneously in the strictly perpendicular external magnetic field,and both modes exhibit the special phenomenon of decreasing spin-wave frequencies with increasing magnetic field strength.Furthermore,the analysis of the decay characteristics reveals that the magnetic damping factor of standing wave mode remains constant regardless of the external magnetic field.Conversely,the magnetic damping of surface wave mode increases as the external magnetic field strength increases.The group velocity of the surface wave mode was analyzed to deter-mine the causes of the external field-dependent properties of the magnetic damping of this mode.Our experiment reveals the spin-wave dynamic characteristics of Co-based Heusler alloy film under the strictly perpendicular external magnetic field,which has positive significance for advancing the appli-cation of such materials in next-generation spintronic devices.
关键词
赫斯勒合金/超快自旋动力学/时间分辨/自旋波模式Key words
Heusler alloy films/ultrafast spin dynamics/time resolution/spin-wave modes引用本文复制引用
基金项目
广东省自然科学基金(2020A1515010411)
广东省高等教育教学改革项目(2019-N466)
广州市科技计划(2023A03J0125)
国家级大学生创新训练资助项目(202211078116)
出版年
2024
NETL
NSTL
万方数据