Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 37: Spin Torque and Spin Excitations I
MA 37.5: Talk
Thursday, April 3, 2014, 10:30–10:45, HSZ 401
Self-consistent determination of the key spin transfer torque parameters from spin wave Doppler experiments — •Helmut Körner, Jean-Yves Chauleau, Hans Bauer, Johannes Stigloher, Georg Woltersdorf, and Christian Back — Department of Physics, Universität Regensburg, D-93040 Regensburg, Germany
Action of spin-polarized electric currents on magnetic textures is now well established both from experimental and theoretical viewpoints [1]. These effects are known as spin-transfer torques (STT). In the case of continuous magnetic distributions, current-induced domain wall (DW) dynamics is a recurrent system of investigation. However, DWs are fairly complicated magnetic structures whose dynamics is consequence of a subtle combination of damping, spin-drift velocity and non-adiabatic parameter. An alternative to domain walls dynamics has been reported by Vlaminck and Bailleul. The current-induced shift of spinwave resonances (spinwave Doppler shift) has been experimentally evidenced using an inductive approach [2].
In this study, we experimentally determine the key spin transfer torque parameters in a fully self-consistent approach by optically accessing current-induced spinwave dynamics in Permalloy stripes using time-resolved scanning Kerr microscopy (TRMOKE). Our technique allows precise access to spinwave characteristics and their current-induced changes, especially the change in decay length which carries the information about the non-adiabaticity.
[1] D.C. Ralph and M.D. Stiles, JMMM 321, 2508 (2009) [2] V. Vlaminck and M. Bailleul, Science 322, 410 (2008)