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

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.

30 pages, 5 Figures, 1 Table, including Supplemental Information

References in corpus (9)

• Magnetic effects at the interface between nonmagnetic oxides
• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Scaling of spin Hall angle in 3d, 4d and 5d metals from Y3Fe5O12/metal spin pumping
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• An experimental demonstration of room-temperature spin transport in n-type Germanium epilayers
• Spin transport and spin conversion in compound semiconductor with non-negligible spin-orbit interaction
• Derivation of effective spin-orbit Hamiltonians and spin lifetimes, with application to SrTiO${}_3$ heterostructures
• Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices

Cited by in corpus (17)

• Roadmap of spin-orbit torques
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Quantum Materials for Spin and Charge Conversion
• Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between SrTiO3 and LaAlO3 at Room Temperature
• Room Temperature Giant Charge-to-Spin Conversion at SrTiO3/LaAlO3 Oxide Interface
• FMR-related phenomena in spintronic devices
• Probe of Spin Dynamics in Superconducting NbN Thin Films via Spin Pumping
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Strain-induced large spin splitting and persistent spin helix at LaAlO${}_3$/SrTiO${}_3$ interface
• Evolution of ferromagnetism in two-dimensional electron gas of LaTiO3/SrTiO3
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature
• Spin-wave-induced lateral temperature gradient in a YIG thin film/GGG system excited in an ESR cavity
• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well
• Spincaloritronic signal generation in non-degenerate Si
• Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings
• Emergence of giant spin-orbit torque in a two-dimensional hole gas on the hydrogen-terminated diamond surface