Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures
Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures
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DOI：
10.1038/s41535-019-0164-1
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发表时间：
2019-05-29
影响因子：
5.7
通讯作者：
Kumah, Divine P.
中科院分区：
文献类型：
--
作者：
Koohfar, Sanaz;Georgescu, Alexandru B.;Kumah, Divine P.
在存在价错配的结晶界面处，可能发生电子和结构相互作用以缓解极性错配，从而导致非块状相的稳定。我们发现，自发重建在极性La0.7Sr0.3MnO3接口与抑制铁磁性的薄膜厚度的顺序上的一个单元电池。利用高分辨电子显微镜、第一性原理、同步辐射X射线散射、磁谱和变温磁力仪研究了La0.7Sr0.3CrO3/La0.7Sr0.3MnO3界面的结构和磁性。发现La0.7Sr0.3CrO3和La0.7Sr0.3MnO3层之间的反铁磁耦合和界面极性畸变的抑制的组合，导致在鲁棒的长程铁磁有序的La0.7Sr0.3MnO3。这些结果强调了在基于二维氧化物磁性系统的器件设计中界面结构和磁性相互作用的至关重要性。
At crystalline interfaces where a valence-mismatch exists, electronic, and structural interactions may occur to relieve the polar mismatch, leading to the stabilization of non-bulk-like phases. We show that spontaneous reconstructions at polar La0.7Sr0.3MnO3 interfaces are correlated with suppressed ferromagnetism for film thicknesses on the order of a unit cell. We investigate the structural and magnetic properties of valence-matched La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 interfaces using a combination of high-resolution electron microscopy, first principles theory, synchrotron X-ray scattering and magnetic spectroscopy and temperature-dependent magnetometry. A combination of an antiferromagnetic coupling between the La0.7Sr0.3CrO3 and La0.7Sr0.3MnO3 layers and a suppression of interfacial polar distortions are found to result in robust long-range ferromagnetic ordering for ultrathin La0.7Sr0.3MnO3. These results underscore the critical importance of interfacial structural and magnetic interactions in the design of devices based on two-dimensional oxide magnetic systems.