Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 24: Spinelectronics / Spin Injection in Heterostructures
MA 24.4: Talk
Thursday, March 25, 2010, 11:00–11:15, H22
Optical detection of spin-pumped magnetization in a Ni81Fe19/Cu multilayer — •Frederik Fohr1, Jaroslav Hamrle1, Helmut Schultheiss1, Alexander A. Serga1, Burkard Hillebrands1, Yasuhiro Fukuma2, Le Wang2, and YoshiChika Otani2 — 1FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2ASI RIKEN, and ISSP, University of Tokyo, Japan.
We report on Brillouin light scattering (BLS) investigations of induced magnetization from a Ni81Fe19-layer to an adjacent copper-wedge via the spin-pumping effect.
The intensity of the detected BLS signal contains information about the precessing magnetization in the Ni81Fe19-layer, which is decaying exponentially with the optical penetration depth, and about the spin pumped magnetization in the copper-wedge, which is decaying with the much longer spin diffusion length. The detected signal in the copper-wedge is a sum of contributions from different depths of the wedge, weighted by the decaying intensity of the probing laser light as well as by the decaying spin-pumped magnetization.
To separate both contributions of the signal experimentally, additional BLS scans were performed on a reference sample, prepared with an interlayer between Ni81Fe19 and copper to block the spin pumping. The measurements on both samples are discussed and compared to their respective calculated BLS intensities.
Support by the DFG within the project JST-DFG Hi380/21-1 is acknowledged.