Novel Spin-Orbit Torque Generation at Room Temperature in an All-Oxide Epitaxial La<sub>0.7</sub> Sr<sub>0.3</sub> MnO<sub>3</sub> /SrIrO<sub>3</sub> System.
basic_science · Level V
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- Record sourced from PubMed, PMID 33960025.
- Also identified by DOI 10.1002/adma.202008269.
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Abstract
Spin-orbit torques (SOTs) that arise from materials with large spin-orbit coupling offer a new pathway for energy-efficient and fast magnetic information storage. SOTs in conventional heavy metals and topological insulators are explored extensively, while 5d transition metal oxides, which also host ions with strong spin-orbit coupling, are a relatively new territory in the field of spintronics. An all-oxide, SrTiO<sub>3</sub> (STO)//La<sub>0.7</sub> Sr<sub>0.3</sub> MnO<sub>3</sub> (LSMO)/SrIrO<sub>3</sub> (SIO) heterostructure with lattice-matched crystal structure is synthesized, exhibiting an epitaxial and atomically sharp interface between the ferromagnetic LSMO and the high spin-orbit-coupled metal SIO. Spin-torque ferromagnetic resonance (ST-FMR) is used to probe the effective magnetization and the SOT efficiency in LSMO/SIO heterostructures grown on STO substrates. Remarkably, epitaxial LSMO/SIO exhibits a large SOT efficiency, ξ<sub>||</sub> = 1, while retaining a reasonably low shunting factor and increasing the effective magnetization of LSMO by ≈50%. The findings highlight the significance of epitaxy as a powerful tool to achieve a high SOT efficiency, explore the rich physics at the epitaxial interface, and open up a new pathway for designing next-generation energy-efficient spintronic devices.