Spin-to-charge conversion in lateral and vertical topological-insulator/ferromagnet heterostructures with microwave-driven precessing magnetization

Abstract

Using the charge-conserving Floquet-Green function approach to open quantum systems driven by external time periodic potential, we analyze how spin current pumped (in the absence of any dc bias voltage) by the precessing magnetization of a ferromagnetic (F) layer is injected {\em laterally} into the interface with strong spin-orbit coupling (SOC) and converted into charge current flowing in the same direction. In the case of metallic interface with the Rashba SOC used in experiments [Nature Comm. {\bf 4}, 2944 (2013)], both spin $I^{S_{\alpha }}$ and charge $I$ current flow within it where $I/I^{S_{\alpha }}\simeq$ 2--8\% (depending on the precession cone angle), while for F/topological-insulator (F/TI) interface employed in related experiments (arXiv:1312.7091) the conversion efficiency is greatly enhanced $I/I^{S_{\alpha }}\simeq$ 40--60\% due to perfect spin-momentum locking on the surface of TI. The spin-to-charge conversion occurs also when spin current is pumped {\em vertically} through the F/TI interface with smaller efficiency $I/I^{S_{\alpha }}\sim 0.001\%$, but with charge current signal being sensitive to whether the Dirac fermions at the interface are massive or massless.

PDFLaTeX, 6 pages, 6 figures; completely revised in order to connect to recent experiments on spin-to-charge conversion using interfacial spin-orbit coupling

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Cited by in corpus (18)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Dirac Spin-Orbit Torques at the Surface of Topological Insulators
• Spin-memory loss due to spin-orbit coupling at ferromagnet/heavy-metal interfaces: Ab initio spin-density matrix approach
• Spin-orbit torque in 3D topological insulator-ferromagnet heterostructure: crossover between bulk and surface transport
• Proximity band structure and spin textures on both sides of topological-insulator/ferromagnetic-metal interface and their transport probes
• Antidamping spin-orbit torque driven by spin-flip reflection mechanism on the surface of a topological insulator: A time-dependent nonequilibrium Green function approach
• Nonequilibrium spin texture within a thin layer below the surface of current-carrying topological insulator Bi${}_2$Se${}_3$: A first-principles quantum transport study
• Spin Orbit Torque in two dimensional Antiferromagnetic Topological Insulators
• Spin-orbit-proximitized ferromagnetic metal by monolayer transition metal dichalcogenide: Atlas of spectral functions, spin textures and spin-orbit torques in Co/MoSe${}_2$, Co/WSe${}_2$ and Co/TaSe${}_2$ heterostructures
• Effective spin-mixing conductance of topological-insulator/ferromagnet and heavy-metal/ferromagnet spin-orbit-coupled interfaces: A first-principles Floquet-nonequilibrium-Green-function approach
• Topological nature of the proper spin current and the spin-Hall torque
• Inverse Edelstein effect of the surface states of a topological insulator
• Deciphering the origin of spin current in spintronic terahertz emitters and its imprint on their electromagnetic radiation via time-dependent density functional theory
• High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling
• Resonant Tunneling Anisotropic Magnetoresistance Induced by Magnetic Proximity
• Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: A first-principles Floquet-nonequilibrium Green's function study
• Chern insulator in a ferromagnetic two-dimensional electron system with Dresselhaus spin-orbit coupling
• Edelstein Effect in Isotropic and Anisotropic Rashba Models