Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Spin-dependent Transport/ Spin Torque
MA 49.5: Talk
Thursday, March 17, 2011, 11:45–12:00, HSZ 04
Thermal activated domain wall depinning: Extraction of the non-adiabatic contribution — •Jan Heinen1, Mathias Kläui1,2, Olivier Boulle3, Gregory Malinowsky4, Christian Ulysse5, and Giancarlo Faini5 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2SwissFEL, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland and Laboratory for Nanomagnetism and Spin Dynamics, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland — 3INAC, CEA, 38054 Grenoble, France — 4Laboratoire de physique des solides, Université Paris-sud, 91405 Orsay, France — 5Phynano Team, Laboratoire de Photonique et de Nanostructures, CNRS, 91460 Marcoussis, France
We report time resolved measurements of the extraordinary hall effect (EHE) on perpendicularly magnetized nanowires with narrow domain wall (DW) structures. Using Co/Pt multilayer nanowires, we have previously shown that despite Joule heating effects it is possible to deduce the non-adiabacity factor β [1] and determined the contribution of spin torque and Oersted field effects from DW depinning experiments [2]. Time resolved experiments to measure the extraordinary hall voltage of a Hall cross show the existance of multiple metastable pinning sites, which can be used to study thermally activated depinning. The variation of an applied external field and the variation of current allows us to extract of the non-adiabaticity factor β.
References: [1] O. Boulle et al., Phys. Rev. Lett. 101, 216601 (2008). [2] J. Heinen et al., Appl. Phys. Lett. 96, 202510 (2010).