Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 40: Transport: Spintronics and magnetotransport (organized by TT)

HL 40.4: Vortrag

Dienstag, 1. April 2014, 10:15–10:30, BEY 81

Dissipationless spin current between two coupled ferromagnets — •Wei Chen, Peter Horsch, and Dirk Manske — Max Planck Institute for Solid State Research, Stuttgart, Germany

We demonstrate the general principle which states that a dissipationless spin current flows between two coupled ferromagnets if their magnetic orders are misaligned. This principle applies regardless the two ferromagnets are metallic or insulating, and also generally applies to bulk magnetic insulators. On a phenomenological level, this principle is analogous to Josephson effect, and yields a dissipationless spin current that is independent from scattering. The microscopic mechanisms for the dissipationless spin current depend on the systems, which are elaborated in details. A uniform, static magnetic field is further proposed to be an efficient handle to create the misaligned configuration and stabilize the dissipationless spin current.