Microwave-driven ferromagnet--topological-insulator heterostructures: The prospect for giant spin battery effect and quantized charge pump devices

Abstract

We study heterostructures where a two-dimensional topological insulator (TI) is attached to two normal metal (NM) electrodes while an island of a ferromagnetic insulator (FI) with precessing magnetization covers a portion of its lateral edges to induce time-dependent exchange field underneath via the magnetic proximity effect. When the FI island covers both lateral edges, such device pumps pure spin current in the absence of any bias voltage, thereby acting as an efficient spin battery with giant output current even at very small microwave power input driving the precession. When only one lateral edge is covered by the FI island, both charge and spin current are pumped into the NM electrodes. We delineate conditions for the corresponding conductances (current-to-microwave-frequency ratio) to be quantized in a wide interval of precession cone angles, which is robust with respect to weak disorder and can be further extended by changes in device geometry.

7 pages, 7 color figures, PDFLaTeX

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• Antidamping spin-orbit torque driven by spin-flip reflection mechanism on the surface of a topological insulator: A time-dependent nonequilibrium Green function approach
• First Principles Study of Angular Dependence of Spin-Orbit Torque in Pt/Co and Pd/Co Bilayers
• ${\mathbb{Z}}_4$ Parafermions in an interacting quantum spin Hall Josephson junction coupled to an impurity spin
• Spin Chern Pumping from the Bulk of Two-Dimensional Topological Insulators
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• Spin Transfer Torque and Electric Current in Helical Edge States in Quantum Spin Hall Devices
• Proximity Effects in Topological Insulator Heterostructures
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• Noiseless manipulation of helical edge state transport by a quantum magnet
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• Transport through quantum spin Hall insulator/metal junctions in graphene ribbons
• Quantized charge-pumping in higher-order topological insulators
• Proposal for an ac spin current source
• Topological Proximity Effects in Graphene Nanoribbon Heterostructures
• Emergence of inductance and capacitance from topological electromagnetism
• Quantized spin pumping in topological ferromagnetic-superconducting nanowires
• Semi-Quantized Spin Pumping and Spin-Orbit Torques in Topological Dirac Semimetals
• Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
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