Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Focus Session "Spin Currents in Magnetic Nanostructures", Organization: Mathias Kläui (Univ. Mainz)

MA 30.5: Vortrag

Mittwoch, 28. März 2012, 16:50–17:10, EB 301

Lateral Spin Valves: Transport Measurements and Magnetization Dynamics — •Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

We study spin-dependent transport in lateral spin-valve devices with tunnel barriers at the interfaces between normal and ferromagnetic metals. Different total conductivities per cross-sectional area are achieved by variation of the oxygen pressure, the oxidation time, and the thickness of the oxidized interface metal layer. We find that with decreasing tunnel conductance the amplitude of the nonlocal spin-valve effect increases by two orders of magnitude up to saturation [1]. Currently the combination of magnetization dynamics and spin transport often addressed as spin-pumping is of great interest [2]. First experimental results including the detection of pure spin currents have been presented [3]. Here we aim at an all-metal lateral spin valve, where the spins are injected into an adjacent normal metal via a ferromagnet with precessing magnetization at resonance. We present a study of the magnetization dynamics of ferromagnetic electrodes. The cone angles of the precessional motion of the magnetization at resonance are determined by measurements of the anisotropic resistance of a single electrode. Large cone angles of up to 13.7 degree are observed [4].

[1] A. Vogel et al., APL 94, 122510 (2009); [2] Y. Tserkovnyak et al., PRL 88, 117601 (2002); [3] M.V. Costache et al., PRB 78, 064423 (2008); [4] N. Kuhlmann et al., PRB submitted (2011).