Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Spin-Dynamics / Spin-Torque III

MA 30.3: Talk

Thursday, March 26, 2009, 10:45–11:00, HSZ 04

Current-Induced Domain Wall Coupling and Domain Wall Motion in Magnetic Nanowires — •Nicholas Sedlmayr¹, Jamal Berakdar¹, and Vitalii Dugaev^2,3 — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120, Halle, Deutschland — ²Department of Physics, Rzeszów University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland — ³Department of Physics and CFIF, Instituto Superior Técnico, TU Lisbon, av. Rovisco Pais, 1049-001, Lisbon, Portugal

We consider the problem of two domain walls (DWs) inside a quasi-one dimensional magnetic nanowire. It is assumed that the distance between DWs is rather small so that the transmission of current results in the current-induced DW coupling. The primary cause of the current-induced interaction between the DWs is the spin torque transferred by the spin current to the second DW after the electrons are transmitted through the first one. The interaction between the two walls is investigated by studying the increased energy caused by scattering events from both walls. Calculating the interaction between the DWs, we found that the current-induced effective potential is oscillating in space, which leads to the oscillating motion of the DW. We go on to see what effect the scattering of current electrons from one wall has on the spin density and spin torque acting on the second domain wall. Assuming, for definiteness, that the first wall is pinned we investigate the motion of the second domain wall.