Band-structure-dependent demagnetization in the Heusler alloy Co₂Mn(1-x)FexSi.
Band-structure-dependent demagnetization in the Heusler alloy Co₂Mn(1-x)FexSi.
复制标题
DOI：
10.1103/physrevlett.105.217202
复制
发表时间：
2010-11
影响因子：
8.6
通讯作者：
D. Steil;Sabine Alebrand;T. Roth;M. Krauss;T. Kubota;M. Oogane;Y. Ando;H. Schneider;M. Aeschlimann
中科院分区：
文献类型：
--
作者：
D. Steil;Sabine Alebrand;T. Roth;M. Krauss;T. Kubota;M. Oogane;Y. Ando;H. Schneider;M. Aeschlimann
研究了两种少数带隙和费米能级不同的Heusler合金（Co <$Mn（1-x）FexSi）的超快退磁。尽管电子自旋翻转跃迁部分地被一种化合物中的带隙所阻挡，但是由时间分辨克尔效应测量的各自的磁化动力学是非常相似的。基于一个动力学模型，包括动量和自旋相关的载流子散射，我们表明，磁化动力学主导的空穴自旋翻转过程，这是不受差距。
We investigate the ultrafast demagnetization for two Heusler alloys (Co₂Mn(1-x)FexSi) with a different lineup of the minority band gap and the Fermi level. Even though electronic spin-flip transitions are partially blocked by the band gap in one compound, the respective magnetization dynamics, as measured by the time-resolved Kerr effect, are remarkably similar. Based on a dynamical model that includes momentum and spin-dependent carrier scattering, we show that the magnetization dynamics are dominated by hole spin-flip processes, which are not influenced by the gap.