Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Magnetization Dynamics III

MA 31.6: Vortrag

Mittwoch, 16. März 2011, 12:15–12:30, HSZ 403

Lateral spin-valve devices operated by spin pumping — •Nils Kuhlmann, Andreas Vogel, Toru Matsuyama, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

In the last years, all-metal lateral spin-valve devices have been studied intensively since they provide fundamental understanding of spintronics [1], as well as new concepts for logic devices [2]. Recently, high frequency properties of nanostructures became of great interest because of potential technological applications. The aim of our work is to build an all-metal lateral spin-valve device, where the injected spin current arises from a ferromagnet driven at ferromagnetic resonance (FMR) with an rf-field, pumping spins into the adjacent normal metal [3]. The detection of a spin current created by spin pumping with a spin-valve structure in non-local geometry provides the possibility to quantify the pumping efficiency but has not yet been accomplished. We present the basic concept of a FMR pumped spin-valve device, and show first results. The cone angle of the magnetization precession of a single electrode driven in FMR was determined via the anisotropic magnetoresistance (AMR) to be up to 14^∘, which is to the best of our knowledge the highest value reportet in the literature so far. Also, the dependence of the interaction between the electrodes on the distance between them was investigated and optimized.

[1] A. Vogel et al., APL 94, 122510 (2009); [2] T. Kimura et al., APL 97, 182501 (2010); [3] M. V. Costache et al., PRL 97, 216603 (2006)