Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: Poster I
HL 35.15: Poster
Dienstag, 8. März 2016, 15:00–19:00, Poster A
Constructing spintronic devices from topological insulators via combination with ferromagnetic materials — •Matthias Götte, Tomi Paananen, Günther Reiss, Michael Joppe, and Thomas Dahm — Fakultät für Physik, Universität Bielefeld, Germany
Topological insulators with their spin-momentum coupled edge or surface states are promising candidates for future spintronic applications. Combining topological insulators with ferromagnetic materials opens possibilities to control current flow in these states, e.g. via quantum tunneling or proximity induced ferromagnetic exchange fields. Here, we construct tunneling magnetoresistance (TMR) devices from ferromagnet/isolator/topological insulator junctions and calculate their potential TMR ratios using realistic tight-binding models. The theoretical values are of the same order of magnitude as in state of the art TMR devices based on conventional ferromagnets.
By performing numerical transport calculations, we investigate the influence of local ferromagnetic exchange fields on charge transport in edge states of two-dimensional topological insulators. Based thereupon we propose a device that creates pure spin currents along the edge of the topological insulators. All calculations are based on a tight-binding model suitable for the Bi2Se3 class of materials.