Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Spin-Dynamics/ Spin-Torque II
MA 7.6: Vortrag
Montag, 23. März 2009, 16:30–16:45, HSZ 04
Influence of microwave irradiation on the spin current induced precession — •Nathalie Reckers1, Julien Cucchiara2, Stéphane Mangin2, Ralf Meckenstock1, Horst Zähres1, Günter Dumpich1, and Jürgen Lindner1 — 1Universität Duisburg-Essen, Standort Duisburg, Institut für Physik und CeNIDE, AG-Farle, Lotharstr. 1, 47048 Duisburg, Germany — 2Nancy-Université, Laboratoire de Physique des Matériaux, CNRS, Boîte Postal 239, 54506 Vandoeuvre les Nancy, France
Nano-structured magnetic pillars composed of multi-layers containing a free layer and a fixed layer are investigated for their magnetoresistance behaviour. Measurements were conducted using a fixed alternating current in the μA range and a variable direct current in the mA range. The measurements can be esplained in the framework of spin-torque effects. For high direct currents a precession of the magnetization is observed. By increasing the direct current the range of the precession is shifted to higher magnetic fields. Moreover, the influence of an irradiated microwave in the GHz-range on the precession is investigated. For this purpose a fixed direct current is chosen while the microwave frequency is varied.