Study of Rashba Spin–Orbit Field at LaAlO3/SrTiO3 Heterointerfaces
| Autor: | Seon Young Moon, Jung-Woo Yoo, Vijayakumar Modepalli, Mi-Jin Jin, Shin-Ik Kim, Inseon Oh, Junhyeon Jo, Seung Hyub Baek, Jungmin Park, Daeseong Choe |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Physics Solid-state physics Condensed matter physics Magnetoresistance media_common.quotation_subject 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Asymmetry Electronic Optical and Magnetic Materials Planar Electric field 0103 physical sciences Materials Chemistry Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering 0210 nano-technology Current density AND gate media_common Voltage |
| Zdroj: | Journal of Electronic Materials. 48:1347-1352 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-018-6788-2 |
| Popis: | Oxide interfaces such as LaAlO3/SrTiO3 (LAO/STO) are interesting platforms for the investigation of ‘spin–orbitronics’ because of their strongly coupled spin and orbital degrees of freedom due to the inversion asymmetry of the structure. In this investigation, we demonstrate a tunable Rashba spin–orbit field at the LAO/STO interface via the application of an external gate electric field. The strength of the Rashba field was indirectly estimated by measuring the planar angle dependence of the anisotropic magnetoresistance (AMR). The asymmetry of the planar AMR between θ = 0 and π indicates the existence of Rashba spin–orbit fields, which are tunable by adjusting the current density and gate electric field. From the AMR measurements, the effective Rashba field exhibits up to 4 T for the application of an external back-gate voltage of 30 V. This controllable and relatively high Rashba field suggests that the LAO/STO is an attractive 2-D interface for potential spin–orbitronic applications, such as spin-charge converters, spin-FETs, and spin–orbit torque devices. |
| Databáze: | OpenAIRE |
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