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A d-orbital electron has an anisotropic electron orbital and is a source ofmagnetism. The realization of a 2-dimensional electron gas (2DEG) embedded at aLaAlO3/SrTiO3 interface surprised researchers in materials and physicalsciences because the 2DEG consists of 3d-electrons of Ti with extraordinarilylarge carrier mobility, even in the insulating oxide heterostructure. To date,a wide variety of physical phenomena, such as ferromagnetism and the quantumHall effect, have been discovered in this 2DEG systems, demonstrating theability of the d-electron 2DEG systems to provide a material platform for thestudy of interesting physics. However, because of both ferromagnetism and theRashba field, long-range spin transport and the exploitation of spintronicsfunctions have been believed difficult to implement in the d-electron 2DEGsystems. Here, we report the experimental demonstration of room-temperaturespin transport in the d-electron-based 2DEG at a LaAlO3/SrTiO3 interface, wherethe spin relaxation length is ca. exceeding 200 nm. Our finding, which countersthe conventional understandings to d-electron 2DEGs, opens a new field ofd-electron spintronics. Furthermore, this work highlights a novel spin functionin the conductive oxide system.

Strong evidence for d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface