Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.71: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Optical detection of spin transport in non-magnetic metals — Frederik Fohr¹, Steffen Kaltenborn¹, Jaroslav Hamrle¹, Helmut Schultheiss¹, •Alexander A. Serga¹, Hans Christian Schneider¹, Burkard Hillebrands¹, Yasuhiro Fukuma², Le Wang², and YoshiChika Otani² — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany. — ²ASI RIKEN, and ISSP, University of Tokyo, Japan.

We detect the dynamic magnetization in non-magnetic metal wedges, composed of silver, copper and platinum and grown on top of a Ni₈₀Fe₂₀ layer. The Ni₈₀Fe₂₀ layer is excited externally by the RF field of a coplanar waveguide (CPW), and generates the dynamic magnetization in the wedge layer via the spin pumping effect. The inelastically scattered light is collected as a function of the local wedge thickness and analysed by Brillouin light scattering (BLS) microscopy. The BLS signal originates from the metal wedges due to inelastic scattering from the spin polarization as well as from the magnetic layer below the wedge. To separate both contributions of the signal experimentally, reference samples are prepared with an interlayer between Ni₈₁Fe₁₉ and the respective metal wedge to block the spin pumping. By comparing the experimental results to a macroscopic spin-transport model we determine the transverse relaxation time of the pumped spin current which is much smaller than the longitudinal relaxation time.

Support by the DFG within the project JST-DFG Hi380/21-1 is acknowledged.