Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.18: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Depinning of magnetic domain walls using pure spin currents — •Nils Motzko¹, Björn Burkhardt¹, Piotr Laczkowski², Laurent Vila², and Mathias Kläui¹ — ¹Institut für Physik, Johannes Gutenberg Universität Mainz — ²Laboratoire Nanostructure et Magnetisme, CEA/INAC, 38054, Grenoble, France

The controlled motion of magnetic domain walls (DWs) is a vital component of various spintronic devices and memory applications, however, conventional methods of DW manipulation via fields or charge currents suffer from limitations due to their scalability or due to Joule heating. An alternative approach is to employ pure spin currents, for example in non-local spin valve (NLSV) configurations. In our measurements the NLSV consists of two permalloy halfrings which are connected via a non-magnetic copper conduit, a geometry which permits the precise positioning of DWs. Here, we analyze the influence of a pulsed spin current on the depinning field of a DW and we observe pure spin current induced depinning without any external field at a charge current density of 0.5*10¹² A/m² and a corresponding spin current density of 6.7*10⁹ A/m². The calculated efficiency (1.1*10⁻¹² T/(A/m²)) is more than 100 times higher than for current induced DW motion (CIDM) (M. Laufenberg et. al., Phys. Rev. Lett. 97, 046602 (2006)). This is attributed to the fact that in our measurements the pure spin current acts as a torque completely perpendicularly to the DW magnetization due to the NLSV design maximizing the acting torque.