论文标题
补偿的Ferrimagnet Mn $ _2 $ ru $ _x $ ga
Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn$_2$Ru$_x$Ga
论文作者
论文摘要
我们研究了完全补偿的半金属Ferrimagnet Mn $ _2 $ ru $ _x $ ga的消灭动态。虽然两种抗磁性耦合的转子均由锰组成，但由于其当地环境的不同，它们表现出不同的温度依赖性。研究了由飞秒激光脉冲触发的Sublatice磁化动力学，以揭示旋转和公共场合交换所扮演的角色。我们发现了一个两步的消灭过程，类似于良好的GD（FECO）$ _ 3 $的案例，在该案例中，这两个MN-Sublattices具有不同的撤电率。使用四温模型对行为进行分析，为两个锰自旋浴场分配不同的温度。即使在这个强烈的交换耦合系统中，两个自旋储层的行为也有很大不同。 Mn $ _2 $ ru $ _x $ ga的半金属性质和强烈的交换耦合，以比GD（FECO）$ _ 3 $更短的时间尺度来旋转角动量保存，这表明低功率，低功率，亚匹克赛车的净动力的净级$ _2 $ _2 $ ru $ _x $ _x $ _x $ ga是可能的。
We study the demagnetization dynamics of the fully compensated half-metallic ferrimagnet Mn$_2$Ru$_x$Ga. While the two antiferromagnetically coupled sublattices are both composed of manganese, they exhibit different temperature dependencies due to their differing local environments. The sublattice magnetization dynamics triggered by femtosecond laser pulses are studied to reveal the roles played by the spin and intersublattice exchange. We find a two-step demagnetization process, similar to the well-established case of Gd(FeCo)$_3$, where the two Mn-sublattices have different demagnetization rates. The behaviour is analysed using a four-temperature model, assigning different temperatures to the two manganese spin baths. Even in this strongly exchange-coupled system, the two spin reservoirs have considerably different behaviour. The half-metallic nature and strong exchange coupling of Mn$_2$Ru$_x$Ga lead to spin angular momentum conservation at much shorter time scales than found for Gd(FeCo)$_3$ which suggests that low-power, sub-picosecond switching of the net moment of Mn$_2$Ru$_x$Ga is possible.
