Spin galvanic effect at the conducting SrTiO3 surfaces

Abstract

The (001) surface of SrTiO3 were transformed from insulating to conducting after Ar+ irradiation, producing a quasi two-dimensional electron gas (2DEG). This conducting surface layer can introduce Rashba spin orbital coupling due to the broken inversion symmetry normal to the plane. The spin splitting of such a surface has recently been demonstrated by magneto-resistance and angular resolved photoemission spectra measurements. Here we present experiments evidencing a large spin-charge conversion at the surface. We use spin pumping to inject a spin current from NiFe film into the surface, and measure the resulting charge current. The results indicate that the Rashba effect at the surface can be used for efficient charge-spin conversion, and the large efficiency is due to the multi-d-orbitals and surface corrugation. It holds great promise in oxide spintronics.

11 pages, 5 figures

References in corpus (16)

• New Perspectives for Rashba Spin-Orbit Coupling
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Spatial imaging of the spin Hall effect and current-induced polarization in two-dimensional electron gases
• Spin-pumping into surface states of topological insulator α-Sn, spin to charge conversion at room temperature
• On the line shape of the electrically detected ferromagnetic resonance
• Carrier freeze-out induced metal-insulator transition in oxygen deficient SrTiO3 films
• Electric Field Tuning of the Rashba Effect in the Polar Perovskite Structures
• Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO${}_3$
• Magnetism, spin texture and in-gap states: Atomic specialization at the surface of oxygen-deficient SrTiO${}_3$
• Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO${}_3$ (001)
• Separating Inverse spin Hall voltage and spin rectification voltage by inverting spin injection direction
• Thickness Dependent Carrier Density at the Surface of SrTiO3 (111) Slabs
• Electric field control of spin lifetimes in Nb-SrTiO${}_3$ by spin-orbit fields
• Controlled formation of high-mobility shallow electron gases in SrTiO3 single crystal

Cited by in corpus (7)

• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Nonlinear planar Hall effect
• Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas
• Inverse spin Hall effect in Nd doped SrTiO3
• Theoretical analysis of the inverse Edelstein effect at the LaAlO${}_3$ / SrTiO${}_3$ interface with an effective tight-binding model: Important role of the second $d_{xy}$ subband
• Emergence of giant spin-orbit torque in a two-dimensional hole gas on the hydrogen-terminated diamond surface
• Controlling Spin-Mixing Conductance in KTaO${}_3$ 2DEGs by Varying Argon-Ion Irradiation Time