论文标题
拓扑范德华磁铁中的非常规压力驱动的元磁过渡
Unconventional pressure-driven metamagnetic transitions in topological van der Waals magnets
论文作者
论文摘要
范德华磁铁和设备中有序状态之间激活元磁过渡带来了巨大的旋转式机会。 We show that external pressure, which enhances the interlayer hopping without introducing chemical disorders, triggers multiple metamagnetic transitions upon cooling in the topological van der Waals magnets Mn(Bi$_{1-x}$Sb$_x$)$_4$Te$_7$, where the antiferromagnetic interlayer superexchange coupling competes with the ferromagnetic由反塞人MN旋转介导的层间耦合。温度压力相图表明，虽然从顺磁到有序状态的排序温度几乎不依赖于压力，但元磁过渡显示出非平凡的压力和温度依赖性，甚至是重新输入。对于这些高度各向异性的磁体，我们将前者归因于排序温度仅弱取决于内部参数，后者是两个层间耦合的参数不同的压力和温度依赖性。我们对这些不同的磁相互作用的独立探测为范德华磁体中有效的磁性操作铺平了途径。
Activating metamagnetic transitions between ordered states in van der Waals magnets and devices bring great opportunities in spintronics. We show that external pressure, which enhances the interlayer hopping without introducing chemical disorders, triggers multiple metamagnetic transitions upon cooling in the topological van der Waals magnets Mn(Bi$_{1-x}$Sb$_x$)$_4$Te$_7$, where the antiferromagnetic interlayer superexchange coupling competes with the ferromagnetic interlayer coupling mediated by the antisite Mn spins. The temperature-pressure phase diagrams reveal that while the ordering temperature from the paramagnetic to ordered states is almost pressure-independent, the metamagnetic transitions show non-trivial pressure and temperature dependence, even re-entrance. For these highly anisotropic magnets, we attribute the former to the ordering temperature being only weakly dependent on the intralayer parameters, the latter to the parametrically different pressure and temperature dependence of the two interlayer couplings. Our independent probing of these disparate magnetic interactions paves an avenue for efficient magnetic manipulations in van der Waals magnets.
