Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 24: Spinelectronics / Spin Injection in Heterostructures

MA 24.4: Vortrag

Donnerstag, 25. März 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.