Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures
Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures
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DOI：
10.1038/nmat4783
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发表时间：
2017-01-01
期刊：
影响因子：
41.2
通讯作者：
Wang, Kang L.
中科院分区：
文献类型：
--
作者：
He, Qing Lin;Kou, Xufeng;Wang, Kang L.
磁性拓扑绝缘体，如Cr掺杂的（Bi，Sb）（2）Te-3提供了一个平台，实现多功能的时间反转破磁物理。通过在反铁磁CrSb中构建Neel有序异质结构，在掺Cr（Bi，Sb）（2）Te-3中构建铁磁有序异质结构，实现了可以通过人工结构工程定制的界面磁现象.通过异质结构和超晶格的几何设计，我们展示了反铁磁交换耦合在操纵磁性拓扑绝缘体的磁性。邻近效应诱导界面自旋织构调制，并建立一个有效的远程交换耦合介导的反铁磁性，显着提高磁有序温度的超晶格。这项工作为拓扑绝缘体与反铁磁材料的结合提供了一个新的框架，并为无耗散拓扑反铁磁自旋电子学开辟了新的途径。
Magnetic topological insulators such as Cr-doped (Bi,Sb)(2)Te-3 provide a platform for the realization of versatile time reversal symmetry-breaking physics. By constructing heterostructures exhibiting Neel order in an antiferromagnetic CrSb and ferromagnetic order in Cr-doped (Bi,Sb)(2)Te-3, we realize emergent interfacial magnetic phenomena which can be tailored through artificial structural engineering. Through deliberate geometrical design of heterostructures and superlattices, we demonstrate the use of antiferromagnetic exchange coupling in manipulating the magnetic properties of magnetic topological insulators. Proximity effects are shown to induce an interfacial spin texture modulation and establish an effective long-range exchange coupling mediated by antiferromagnetism, which significantly enhances the magnetic ordering temperature in the superlattice. This work provides a new framework on integrating topological insulators with antiferromagnetic materials and unveils new avenues towards dissipationless topological antiferromagnetic spintronics.