铁磁双亚晶格体系中交换与自旋守恒散射过程的相互作用
Interplay of exchange and spin-conserving scattering processes in a ferromagnetic two-sublattice system
AI总结：
本文研究反铁磁耦合双亚晶格体系中交换与自旋守恒散射的相互作用，采用巡游-局域电子耦合模型，数值分析热致超快磁化动力学，明确自旋守恒散射对超短时间尺度交换驱动自旋动力学的影响。
AI中文摘要：
在磁性合金或分子磁体与磁性衬底耦合形成的混合体系中，交换相互作用会在激发后引发快速自旋动力学。我们研究了反铁磁耦合双亚晶格体系中由交换相互作用导致的电子电荷与自旋动力学。我们采用亚铁磁合金的简化模型，将其视为巡游电子态与局域电子态的耦合体系，并引入两者间的交换耦合；对巡游体系，我们纳入了电子-电子库仑散射和电子-声子散射。我们数值研究了由交换散射与自旋无关散射过程的相互作用引发的热致超快磁化动力学，讨论了亚晶格退磁与弛豫动力学的不同情景。我们的结果强调了自旋守恒电子-电子散射过程在超短时间尺度上对交换驱动自旋动力学的影响。
英文摘要：
In magnetic alloys or hybrid systems formed by molecular magnets coupled to a magnetic substrate, the exchange interaction leads to fast spin dynamics after excitation. We investigate the electronic charge and spin dynamics due to the exchange interaction in a two-sublattice system with antiferromagnetic coupling. We employ a simplified model for a ferrimagnetic alloy as a coupled system of itinerant and localized electron states together with an exchange coupling between the two. For the itinerant system we include electron-electron Coulomb scattering and electron-phonon scattering. We study numerically the heat-induced ultrafast magnetization dynamics due to the interplay of exchange scattering and spin-independent scattering processes and discuss different scenarios for the demagnetization and relaxation dynamics of the sublattices. Our results highlight the impact of spin-conserving electron-electron scattering processes on the exchange-driven spin dynamics on ultrashort timescales.
