Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3
Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3
复制标题
由于 SrTiO3 的四方磁畴结构，EuS 的空间调制磁结构
DOI：
10.1103/physrevmaterials.1.074406
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发表时间：
2017
影响因子：
3.4
通讯作者：
Moler, Kathryn A.
中科院分区：
文献类型：
--
作者：
Rosenberg, Aaron J.;Katmis, Ferhat;Kirtley, John R.;Gedik, Nuh;Moodera, Jagadeesh S.;Moler, Kathryn A.
铁磁体与拓扑超导体或绝缘体的组合允许支持诸如手征边缘模式和马约拉纳费米子的激发的物质的新相。EuS是一种居里温度约为16 K的宽带隙铁磁绝缘体，而（STO）是工程异质结构的重要衬底，可以支持这些相。我们提出了扫描超导量子干涉仪测量EuS外延生长在STO上，揭示铁磁性和顺磁性的微米级变化。这些变化是定向沿着STO晶轴，只有改变它们的配置热循环后，在105 K以上的STO的结构转变温度，表明所观察到的磁性特征是由于EuS和STO的四元结构之间的耦合。我们推测，STO tetravel扭曲可能应变EuS，改变微米尺度上的磁各向异性。这一结果表明，从EuS生长在STO上的感应磁秩序的局部变化需要考虑工程时，需要空间均匀交换的物质的新阶段。
The combination of ferromagnets with topological superconductors or insulators allows for new phases of matter that support excitations such as chiral edge modes and Majorana fermions. EuS, a wide-bandgap ferromagnetic insulator with a Curie temperature around 16 K, and(STO), an important substrate for engineering heterostructures, may support these phases. We present scanning superconducting quantum interference device measurements of EuS grown epitaxially on STO that reveal micron-scale variations in ferromagnetism and paramagnetism. These variations are oriented along the STO crystal axes and only change their configuration upon thermal cycling above the STO cubic-to-tetragonal structural transition temperature at 105 K, indicating that the observed magnetic features are due to coupling between EuS and the STO tetragonal structure. We speculate that the STO tetragonal distortions may strain the EuS, altering the magnetic anisotropy on a micron scale. This result demonstrates that local variation in the induced magnetic order from EuS grown on STO needs to be considered when engineering new phases of matter that require spatially homogeneous exchange.