Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.41: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Domain wall motion in a ferromagnet induced by pure diffusive spin currents in graphene — •Fabienne Musseau1, Michele Voto2, Alexander Pfeiffer1, Nils Richter1, Luis Lopez Diaz2, and Mathias Kläui1 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 2Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
Due to the miniaturization of systems to the nanoscale, the physics of surfaces and interfaces is a major area of research. On the applications side, novel storage concepts, such as the racetrack memory use spin currents [1] in ferromagnetic nanowires where data is encoded as a pattern of magnetic domains. Alternatively synchronous motion of domains can also be obtained by special field geometries [2]. Another possibility is to use pure diffusive spin currents to manipulate the magnetization in a ferromagnet [3,4]. As here the limitation is the spin transport in the spin conduit, we use graphene as due to its low spin-orbit coupling and high mobility a large spin diffusion length ensues, allowing for large spin currents [5]. We investigate the displacement of domain walls via spin torques exerted by pure diffusive spin currents in a non-local spin valve geometry [3,4]. We compare our results to micromagnetic simulations to understand the acting torques.
References [1] Parkin et al., Science 320, 190 (2008) [2] Kim et al., Nat. Commun. 5, 3429 (2014) [3] Motzko et al., Phys. Rev. B, 88, 214405 (2013) [4] Ilgaz et al., Phys. Rev. Lett. 105, 076601 (2010) [5] Tombros et al., Nature 448, 571 (2007)