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Unconventional Pressure-Driven Metamagnetic Transitions in Topological van der Waals Magnets
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.nanolett.2c01680 Tiema Qian 1 , Eve Emmanouilidou 1 , Chaowei Hu 1 , Jazmine C Green 1 , Igor I Mazin 2, 3 , Ni Ni 1
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.nanolett.2c01680 Tiema Qian 1 , Eve Emmanouilidou 1 , Chaowei Hu 1 , Jazmine C Green 1 , Igor I Mazin 2, 3 , Ni Ni 1
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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(Bi1–xSbx)4Te7, 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 nontrivial 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 and 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.
中文翻译：
拓扑范德华磁体中非常规压力驱动的超磁跃迁
激活范德华磁体和器件中有序态之间的超磁跃迁为自旋电子学带来了巨大的机遇。我们表明，在拓扑范德华磁体 Mn(Bi 1– x Sb x ) 4 Te 7中冷却时，外部压力会在不引入化学紊乱的情况下增强层间跳跃，从而触发多个超磁跃迁，其中反铁磁层间超交换耦合与由反位 Mn 自旋介导的铁磁层间耦合竞争。温度 - 压力相图表明，虽然从顺磁性到有序状态的有序温度几乎与压力无关，但超磁性转变显示出非平凡的压力和温度依赖性，甚至是重入。对于这些高度各向异性的磁体，我们将前者归因于有序温度仅微弱地依赖于层内参数，而后者归因于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的有效磁操作铺平了道路。
更新日期：2022-06-22
中文翻译：
拓扑范德华磁体中非常规压力驱动的超磁跃迁
激活范德华磁体和器件中有序态之间的超磁跃迁为自旋电子学带来了巨大的机遇。我们表明，在拓扑范德华磁体 Mn(Bi 1– x Sb x ) 4 Te 7中冷却时，外部压力会在不引入化学紊乱的情况下增强层间跳跃，从而触发多个超磁跃迁，其中反铁磁层间超交换耦合与由反位 Mn 自旋介导的铁磁层间耦合竞争。温度 - 压力相图表明，虽然从顺磁性到有序状态的有序温度几乎与压力无关，但超磁性转变显示出非平凡的压力和温度依赖性，甚至是重入。对于这些高度各向异性的磁体，我们将前者归因于有序温度仅微弱地依赖于层内参数，而后者归因于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的有效磁操作铺平了道路。
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