SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.61: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Coupling Strength Controlling Vortex Trajectories' Oscillations in Coupled Vortices Spintronic Oscillator — •Abbass Hamadeh1, Abbas Koujok1, Salvatore Perna2, Steffen Wittrock3, Vitaliy Lomakin4, Gregoire de Loubens5, Olivier Klein6, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2University of Naples Federico II, Naples, Italy — 3Max-Born-Institute for Nonlinear Optics & Short Pulse Spectroscopy, Berlin, Germany — 4Center for Magnetic Recording Research, Uni. of California San Diego, La Jolla, California 92093-0401, USA — 5SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif-sur-Yvette, France — 6Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, INAC-Spintec, 38054 Grenoble, France
The magnetic vortex state in nano-magnetic structures is a subject of intensive research since it can be brought into auto-oscillation by spin transfer torque. The coupling of vortices via spin-transfer torque and dipolar fields allows to realize complex non-linear dynamics potentially useful for unconventional computing and data processing. For this purpose, we have studied the auto-oscillating modes of an oscillator based on two coupled vortices in a NiFe/Cu/NiFe nano-patterned stack. The respective system was investigated both experimentally and micro-magnetically for different applied magnetic fields and currents. Experimentally, we observed four qualitatively different configurations of GMR spectra. Our simulations show that these different states can be related to the complex, non-circular motion of the coupled vortices.