论文标题
超快的旋转泵送诱导动态交换耦合的超快光学观察在铁磁半导体/金属双层中
Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer
论文作者
论文摘要
磁性双层中的自旋角动量转移为下一代旋转器设备提供了超快和低损耗操作的可能性。我们通过时间分辨的磁光kerr效应（TRMOKE）报告了CO $ _2 $ feal/（GA，MN）中磁化预读的磁化预读的现场和温度依赖性测量值。对有效吉尔伯特阻尼和相移的分析表明，由于谐振时加强旋转泵送，两种铁磁（FM）层之间的动态交换耦合的明确特征。动态交换耦合的温度依赖性揭示了（GA，MN）中铁磁性的主要贡献。
Spin angular momentum transfer in magnetic bilayers offers the possibility of ultrafast and low-loss operation for next-generation spintronic devices. We report the field- and temperature- dependent measurements on the magnetization precessions in Co$_2$FeAl/(Ga,Mn)As by time-resolved magneto-optical Kerr effect (TRMOKE). Analysis of the effective Gilbert damping and phase shift indicates a clear signature of an enhanced dynamic exchange coupling between the two ferromagnetic (FM) layers due to the reinforced spin pumping at resonance. The temperature dependence of the dynamic exchange-coupling reveals a primary contribution from the ferromagnetism in (Ga,Mn)As.
