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MA: Fachverband Magnetismus
MA 49: Spin-dependent Transport/ Spin Torque
MA 49.7: Talk
Thursday, March 17, 2011, 12:15–12:30, HSZ 04
Probing the Nonadiabaticity of the Spin-Torque via direct Imaging of Current induced Vortex Domain Wall Excitations — •M. Stärk1,2, A. Bisig1,3, J. Rhensius2,4, C. Moutafis1, J. Heidler1, G. Kiliani2, M. Kläui1,2, H. Stoll3, L.J. Heyderman4, B. Van Waeyenberge5, and T. Tyliszczak6 — 1SwissFEL, PSI, 5232 Villigen and Laboratory of Nanomagnetism and Spin Dynamics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — 2Universität Konstanz, 78457 Konstanz, Germany — 3Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany — 4Labor für Mikro- und Nanotechnologie, PSI 5232 Villigen, Switzerland — 5Ghent University, 9000 Ghent, Belgium — 6Advanced Light Source, 94720 Berkeley LBNL, USA
Magnetic vortex domain walls, where the magnetization curls in the plane of the wire around a central vortex core, are candidates for novel memory devices based on current induced domain wall motion or vortex core switching. Here we report on the investigation of the interaction between vortex domain walls and microwave spin polarized currents, employing time-resolved scanning transmission x-ray microscopy (STXM). Beyond the one dimensional quasi particle treatment of magnetic domain walls we describe the wall as a composite object consisting of a vortex and two half-vortices. From the phase-shift of the response of the different topological defects, we measure the adiabatic and non-adiabatic spin torque terms to test predictions of the correlations between the different spin torque terms and the local magnetization gradients.