Configurational dependence of the magnetization dynamics in spin valve systems: Influence of spin pumping and domain wall induced coupling

R. Salikhov, R. Abrudan, F. Brüssing, K. Gross, C. Luo, K. Westerholt, H. Zabel, F. Radu, and I. A. Garifullin

Phys. Rev. B 86, 144422 – Published 31 October 2012

Abstract

Using time-resolved x-ray resonant magnetic scattering we report on the precessional dynamics of spin valve systems with parallel (P) and antiparallel (AP) orientation of the ferromagnetic layers separated by a nonmagnetic spacer layers. Previously we observed in Co/Cu/Ni $_{81}$ Fe $_{19}$ (Py) spin valve systems an increase of the magnetic damping parameter in Py with changing magnetization direction of Py and Co layers from P to AP orientation [Salikhov et al., Appl. Phys. Lett. 99, 092509 (2011)]. We attributed this finding to the configurational dependence of the spin pumping effect [Kim and Chappert, J. Magn. Magn. Mater. 286, 56 (2005)]. Here we extend our earlier findings by investigating the temperature dependence of the spin pumping effect and possible other causes for the configurational dependence of the damping parameter, such as domain wall induced coupling or magnetic dipole coupling. The main focus is on Co/Cu/Py trilayers and on Co $_{2}$ MnGe/V/Py trilayers with spin valve properties.