利用时间分辨磁光克尔光谱技术,研究TbFeCo磁光薄膜飞秒激光感应超快磁化动力学过程.观测到亚皮秒的超快退磁过程,符合“三温度”模型中由电子-自旋散射引起的超快退磁机制.磁化动力学的激发功率流密度依赖关系结果表明,随着激发功率流密度的增大,超快退磁程度增加和磁化恢复时间延长,符合“三温度”模型的解释.在衬底厚度不同的TbFeCo样品对比实验中发现,同功率流密度激发下衬底较薄的样品退磁程度更高,磁化恢复速率更快.
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