Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping
Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping
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DOI：
10.1038/ncomms7306
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发表时间：
2015-02-01
影响因子：
16.6
通讯作者：
Bibes, M.
中科院分区：
文献类型：
--
作者：
Bruno, F. Y.;Grisolia, M. N.;Bibes, M.
在复合氧化物之间的界面处，电子、轨道和磁性重构可能会产生所涉及材料中不存在的物质状态，为电子和自旋电子器件提供了新的可能性。在这里，我们表明，磁重建有很强的影响界面自旋选择性，一个关键参数控制自旋输运的磁性隧道结。在反铁磁LaFeO 3（LFO）和铁磁La0.7Sr0.3MnO3（LSMO）的外延异质结构结合层，我们发现，净磁矩诱导在前几个单位平面的LFO与LSMO界面附近。使用X射线光发射电子显微镜，我们表明锰氧化物电极的铁磁畴结构被压印到反铁磁隧道势垒中，赋予其自旋选择性。最后，我们发现铁磁和反铁磁相互作用的自旋排列通过自旋极化和自旋过滤效应对LSMO/LFO/LSMO结的隧道磁电阻产生了强烈的影响.
At interfaces between complex oxides, electronic, orbital and magnetic reconstructions may produce states of matter absent from the materials involved, offering novel possibilities for electronic and spintronic devices. Here we show that magnetic reconstruction has a strong influence on the interfacial spin selectivity, a key parameter controlling spin transport in magnetic tunnel junctions. In epitaxial heterostructures combining layers of antiferromagnetic LaFeO3 (LFO) and ferromagnetic La0.7Sr0.3MnO3 (LSMO), we find that a net magnetic moment is induced in the first few unit planes of LFO near the interface with LSMO. Using X-ray photoemission electron microscopy, we show that the ferromagnetic domain structure of the manganite electrodes is imprinted into the antiferromagnetic tunnel barrier, endowing it with spin selectivity. Finally, we find that the spin arrangement resulting from coexisting ferromagnetic and antiferromagnetic interactions strongly influences the tunnel magnetoresistance of LSMO/LFO/LSMO junctions through competing spin-polarization and spin-filtering effects.