Pure spin current devices based on ferromagnetic topological insulators

Abstract

Two-dimensional topological insulators possess two counter propagating edge channels with op- posite spin direction. Recent experimental progress allowed to create ferromagnetic topological insulators realizing a quantum anomalous Hall (QAH) state. In the QAH state one of the two edge channels disappears due to the strong ferromagnetic exchange field. We investigate heterostuctures of topological insulators and ferromagnetic topological insulators by means of numerical transport calculations. We show that spin current flow in such heterostructures can be controlled with high fidelity. Specifically, we propose spintronic devices that are capable of creating, switching and de- tecting pure spin currents using the same technology. In these devices electrical currents are directly converted into spin currents, allowing a high conversion efficiency. Energy independent transport properties in combination with large bulk gaps in some topological insulator materials may allow operation even at room temperature.

arXiv comment9 pages, 5 figures

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• Dirac-Electrons-Mediated Magnetic Proximity Effect in Topological Insulator / Magnetic Insulator Heterostructures
• Confinement and Fermion Doubling Problem in Dirac-like Hamiltonians
• Strong Photothermoelectric Response and Contact Reactivity of the Dirac Semimetal ZrTe5
• Spin Transport and Spin Pump in Graphene-like Materials: Effect of tilt in Dirac cones
• Pure Spin Current Injection in Hydrogenated Graphene Structures
• Edge spin transport in the disordered two-dimensional topological insulator WTe${}_2$
• Ferromagnetic and insulating behavior of LaCoO3 films grown on a (001) SrTiO3 substrate. A simple ionic picture explained ab initio
• Theoretical investigation of the applicability of the Meservey-Tedrow technique to the surface states of topological insulators
• Giant Spin Transport Anisotropy in Magnetic Topological Insulators
• Determination of Out-of-plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy