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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.75: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Improvement of the spin torque reversal by resonant microwave currents — •Lukas Fricke, Santiago Serrano-Guisan, and Hans-Werner Schumacher — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

We study ultra fast spin torque (ST) magnetization reversal in magnetic tunnel junctions by numerical simulations in the macrospin (single-domain) approximation. Magnetization reversal by pulsed currents under a hard axis bias field is studied. We find optimized low current switching for low fields inducing a tilt of the free layer magnetization out of the easy axis by about 6°. Similar results are obtained with tilted pinned layer devices. Furthermore ST reversal assisted by resonant microwave currents is considered. Here, an AC oscillation with frequency close to the ST precession frequency of the free layer is superimposed on the DC current pulse. The efficiency and reversal time of such AC assisted ST reversal schemes is investigated.