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TbFeCo薄膜激光诱导超快自旋动力学的成分比研究

Study of Laser Induced Ultrafast Spin Dynamics on TbFeCo Film with Different Composition Ratio
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摘要 采用基于磁光克尔效应的泵浦-探测技术研究不同成分比TbFeCo磁性薄膜的激光诱导超快自旋动力学过程,成功观测到具有几百飞秒的超快退磁以及几十皮秒的慢退磁的两步退磁现象.根据四温度模型,TbFeCo中的第一步超快退磁现象是由电子-自旋作用引起,第二步慢退磁现象是由晶格-FeCo自旋-Tb自旋作用引起的.不同成分比TbFeCo样品的对比实验显示,随着Tb含量增加,两步退磁程度减弱,第二步慢退磁时间增大,进一步验证四温度模型的合理性. Using pump-probe technology based on magneto-optical Kerr effect,the ultrafast spin dynamics on TbFeCo magnetic film with different composition ratio was investigated.Two-step demagnetization is observed,which contains an ultrafast demagnetization and a slow demagnetization.The ultrafast demagnetization is caused by electron-spin interaction while the slow demagnetization can be explained by lattice-FeCo spin-Tb spin as fourtemperature model.Ultrafast spin dynamics on TbFeCo magnetic film with different composition ratio shows that two-step demagnetization is weaken and time of the slow demagnetization increases with increasement of Tb.
作者 陆一帆 姜建伟 张晓磊 楼柿涛 金庆原
机构地区 华东师范大学精密光谱科学与技术国家重点实验室
出处 《复旦学报（自然科学版）》 CAS CSCD 北大核心 2015年第5期586-590,共5页 Journal of Fudan University：Natural Science
基金 国家自然科学基金(11274113 11204081) 上海市自然科学基金(12ZR1443600)
关键词 TbFeCo磁性薄膜 激光诱导超快自旋动力学 两步退磁 四温度模型 TbFeCo magnetic film laser induced ultrafast spin dynamics two-step demagnetization four-temperature model
分类号 O436.4 [机械工程—光学工程]
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参考文献14

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复旦学报（自然科学版）
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