Interface Magnetism in Heteroepitaxial Complex Oxide Films

Yaohua Liu (Materials Science Division, Argonne National Laboratory)

Complex oxide materials host many interesting collective phenomena in condensed matter physics, such as high-temperature superconductivity, various forms of magnetism and ferroelectricity, as well as phase competitions between these states. Recently, it has become possible to create heteroepitaxial complex oxide films with atomic precision, and such structures are of keen interest because modified bonding at the interfaces can give rise to fundamentally new phenomena and valuable functionalities. A myriad of intriguing phenomena have been discovered, including emergent magnetic behaviors and exotic superconducting and ferroelectric phases. Particularly, induced interface magnetization is commonly observed at epitaxial interfaces between layered transition-metal oxides; however, much less attention has been given to its effects on the charge transport. Here I highlight our work utilizing polarized neutrons and x-rays to explore the non-trivial effects on the magnetotransport properties from interface magnetization at the layered cuprate and manganite interfaces, in superconducting spin switches [1] and magnetic tunneling junctions [2].

[1] Yaohua Liu et al., "Effect of interface-induced exchange field on cuprate-manganite spin switches", Phys. Rev. Lett. 108, 207205 (2012). [2] Yaohua Liu et al., "An emergent spin-filter at the interface between ferromagnetic and insulating layered oxides", arXiv:1307.5475.

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