Tuning magnetic anisotropy by interfacially engineering the oxygen coordination environment in a transition metal oxide
Tuning magnetic anisotropy by interfacially engineering the oxygen coordination environment in a transition metal oxide
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DOI：
10.1038/nmat4580
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发表时间：
2016-04-01
期刊：
影响因子：
41.2
通讯作者：
Shimakawa, Yuichi
中科院分区：
文献类型：
--
作者：
Kan, Daisuke;Aso, Ryotaro;Shimakawa, Yuichi
电子、自旋和晶格之间的强相关性源于过渡金属d和氧p轨道之间的强杂化是过渡金属氧化物功能特性的原因。具有化学突变界面的人工氧化物异质结构为工程键合几何形状提供了一个平台，从而导致出现现象。在这里，我们证明了钙钛矿，SrRuO 3，通过异质结构与Ca0.5Sr0.5TiO3（0-4单层厚）生长在GdScO 3衬底上的氧配位环境的控制。我们发现，一个Ru-O-Ti键角的SrRuO 3/ Ca0.5Sr0.5TiO3界面可以工程通过逐层控制的Ca0.5Sr0.5TiO3层的厚度，和工程Ru-O-Ti键角不仅稳定的Ru-O-Ru键角从未见过在体SrRuO 3，但也调谐在整个SrRuO 3层的磁各向异性。结果表明，氧配位环境的界面工程允许控制功能氧化物异质结构中的额外自由度。
Strong correlations between electrons, spins and lattices-stemming from strong hybridization between transition metal d and oxygen p orbitals-are responsible for the functional properties of transition metal oxides. Artificial oxide heterostructures with chemically abrupt interfaces provide a platform for engineering bonding geometries that lead to emergent phenomena. Here we demonstrate the control of the oxygen coordination environment of the perovskite, SrRuO3, by heterostructuring it with Ca0.5Sr0.5TiO3 (0-4 monolayers thick) grown on a GdScO3 substrate. We found that a Ru-O-Ti bond angle of the SrRuO3 / Ca0.5Sr0.5TiO3 interface can be engineered by layer-by-layer control of the Ca0.5Sr0.5TiO3 layer thickness, and that the engineered Ru-O-Ti bond angle not only stabilizes a Ru-O-Ru bond angle never seen in bulk SrRuO3, but also tunes the magnetic anisotropy in the entire SrRuO3 layer. The results demonstrate that interface engineering of the oxygen coordination environment allows one to control additional degrees of freedom in functional oxide heterostructures.