Efficient Charge-Spin Conversion and Magnetization Switching though Rashba Effect at Topological Insulator/Ag Interface

Abstract

We report the observation of efficient charge-to-spin conversion in the three-dimensional topological insulator (TI) Bi2Se3 and Ag bilayer by the spin-torque ferromagnetic resonance technique. The spin orbit torque ratio in the Bi2Se3/Ag/CoFeB heterostructure shows a significant enhancement as the Ag thickness increases to ~2 nm and reaches a value of 0.5 for 5 nm Ag, which is ~3 times higher than that of Bi2Se3/CoFeB at room temperature. The observation reveals the interfacial effect of Bi2Se3/Ag exceeds that of the topological surface states (TSS) in the Bi2Se3 layer and plays a dominant role in the charge-to-spin conversion in the Bi2Se3/Ag/CoFeB system. Based on the first-principles calculations, we attribute our observation to the large Rashba-splitting bands which wrap the TSS band and has the same net spin polarization direction as TSS of Bi2Se3. Subsequently, we demonstrate for the first time the Rashba induced magnetization switching in Bi2Se3/Ag/Py with a low current density of 5.8 X 10^5 A/cm2.

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Cited by in corpus (11)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• FMR-related phenomena in spintronic devices
• Spin-Orbit Torque and Nernst Effect in Bi-Sb/Co Heterostructures
• Benchmarking of spin-orbit torque switching efficiency in Pt alloys
• Origin and Large Enhancement of Large Spin Hall Angle in Weyl Semimetals LaAl$X$ ($X$=Si, Ge)
• Spin-orbit torques and spin Hall magnetoresistance generated by twin-free and amorphous Bi0.9Sb0.1 topological insulator films
• Spin-orbit torques and magnetotransport properties of $\alpha$-Sn and $\beta$-Sn heterostructures
• Spin-orbitronics at a topological insulator-semiconductor interface
• Spin-Hall effect due to the bulk states of topological insulators: Extrinsic contribution to the conserved spin current
• Spin transfer torques due to the bulk states of topological insulators
• Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings