Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.22: Poster

Tuesday, March 12, 2013, 10:30–13:30, Poster D

Current-induced spinwave doppler shift evidenced by time-resolved kerr microscopy — Jean-Yves Chauleau, Hans Bauer, •Helmut Koerner, Mirkow Ribow, Georg Woltersdorf, and Christian Back — Physics Departement, Universität Regensburg, universitätsstrasse 31, 93040 Regensburg, Germany

Action of spin-polarized electric currents on magnetic textures is now well established both from experimental and theoretical viewpoints. 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.

In this study, we demonstrate the ability of time-resolved scanning Kerr microscopy (TRMOKE) to investigate the spin-transfer torque effects on propagating spin waves in Permalloy stripes. This approach allows not only the measurement of the full waves spectrum but also a direct imaging of the different modes present in the stripe. Wavevector, damping length and group velocity are directly measured experimentally. This is of utmost importance in order to accurately obtain the spin drift velocity, essential root of any evaluation and study of the non-adiabatic parameter.