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Realization of d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface

Research paper by Ryo Ohshima, Yuichiro Ando, Kosuke Matsuzaki, Tomofumi Susaki, Mathias Weiler, Stefan Klingler, Hans Huebl, Eiji Shikoh, Teruya Shinjo, Sebastian T. B. Goennenwein, Masashi Shiraishi

Indexed on: 18 Jan '16Published on: 18 Jan '16Published in: Physics - Materials Science



Abstract

A d-orbital electron has an anisotropic electron orbital and is a source of magnetism. The realization of a 2-dimensional electron gas (2DEG) embedded at a LaAlO3/SrTiO3 interface surprised researchers in materials and physical sciences because the 2DEG consists of 3d-electrons of Ti with extraordinarily large carrier mobility, even in the insulating oxide heterostructure. To date, a wide variety of physical phenomena, such as ferromagnetism and the quantum Hall effect, have been discovered in this 2DEG systems, demonstrating the ability of the d-electron 2DEG systems to provide a material platform for the study of interesting physics. However, because of both ferromagnetism and the Rashba field, long-range spin transport and the exploitation of spintronics functions have been believed difficult to implement in the d-electron 2DEG systems. Here, we report the experimental demonstration of room-temperature spin transport in the d-electron-based 2DEG at a LaAlO3/SrTiO3 interface, where the spin relaxation length is ca. exceeding 200 nm. Our finding, which counters the conventional understandings to d-electron 2DEGs, opens a new field of d-electron spintronics. Furthermore, this work highlights a novel spin function in the conductive oxide system.