论文标题
通过3D-4F InterSublattice Exchange偶联偶联的铁磁性GDX（COFE）1-X合金中强烈调制的超快速反电磁和磁化进液动力学
Strongly modulated ultrafast demagnetization and magnetization precession dynamics in ferrimagnetic Gdx(CoFe)1-x alloys via 3d-4f intersublattice exchange coupling
论文作者
论文摘要
在稀土（RE）转换金属（TM）合金中操纵sublattice相互作用strengh（JRE-TM）是了解如何有效地了解激光诱导的角动量从3D旋转到4F旋转的关键问题，并且可以更好地控制超级旋转动力学。在这项工作中，系统地研究了激光诱导的电磁过程与GDCOFE合金的InterSublattice 3D-4F相互作用之间的关系。当角动量转移3D和4F之间的旋转之间，可以通过JRE-TM调节，超快的两阶段反电磁过程可能会变为一个阶段模式。此外，基于用LLG方程的铁磁共振方法，激光诱导的磁化进进过程在角动量补偿点处推导的有效G因子和阻尼常数。结果提供了一种有效操纵实际应用的超快消灭时间的替代方法。
Manipulation of the intersublattice interaction strengh (JRE-TM) in rare earth (RE)-transition metal (TM) alloys is a key issue to understand how efficiently the laser-induced angular momentum transfers from 3d to 4f spins and to have a better control of the ultrafast spin dynamics. In this work, the relationships between laser-induced demagnetization process and the intersublattice 3d-4f interaction for the GdCoFe alloys were systematically studied. The ultrafast two-stage demagnetization process could change into a one-stage mode as the angular momentum transferring channel between 3d and 4f spins is switched off, which could be modulated by JRE-TM. Furthermore, both the effective g-factor and damping constant deduced by the subsequently laser-induced magnetization precession process diverge at the angular momentum compensation point based on the ferromagnetic resonance method with the LLG equations. The results provide an alternative way to efficiently manipulate the ultrafast demagnetization time for practical applications.
