Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: PhD Student Symposium: "Spintronics on the Way to modern Storage Technology I", Organization: "Univ. Mainz team"

MA 40.4: Vortrag

Donnerstag, 29. März 2012, 11:15–11:30, BH 243

Large relaxation times in permalloy reprogrammable magnonic crystals — •Rupert Huber, Thomas Schwarze, Georg Duerr, and Dirk Grundler — Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, James-Franck-Str., D-85748 Garching b. München, Germany

Stimulated by photonic crystals artificial band structures for magnons have attracted growing interest recently. The so called magnonic crystals are expected to have promising impact for nanometer sized spin wave logic elements. We have produced a one-dimensional densely packed ferromagnetic wire array by electron beam lithography and lift-off processing of 30 nm thick permalloy. This is based on a double exposure process, in order to avoid proximity effects at a period of 300 nm. We present data obtained by all electrical spin wave spectroscopy (AESWS). [1] Using a vector network analyzer and two collinear coplanar waveguides we measure spin wave propagation. The signals depend characteristically on an applied in-plane field reflecting the reprogrammable band structure [2]. We present quantitative data on velocities and relaxation times extracted from the phase information of the propagating spin wave.[1] We acknowledge financial support through the Nanoinitiative Munich (NIM) and the European Community*s Seventh Framework Programm (FP7/2007-2013) under Grant Agreement no. 228673 MAGNONICS. [1] Ballieul et al., APL, 83, 5 (2003) [2] J. Topp et al., PRL 104, 207205 (2010)