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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.26: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Numerical dynamic study of two coupled vortex-based spin transfer oscillator — •Abbass Hamadeh1, Milan Ender1, Vitally Lomakin2, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany — 2Center for Magnetic Research, University of California at San Diego, La Jolla, CA, USA.
The magnetic vortex state in nano-magnetic structures is a subject of intensive research since it offers many applications. To gain key insight into engineering and manipulating the vortex core (VC) orientation reversal, it is crucial to fully understand their coupled dynamics. For this purpose, we have studied micromagnetically the auto-oscillating modes in a spin-transfer vortex oscillator with vortices in two coupled thin and thick layers for different applied magnetic fields and currents. We find that for the anti-parallel vortex polarity configurations, a region with downward/upward magnetization appears at the inner side of the vortex core resembling a deformation of the vortex profile. This deformation, induced by the vortex core's accelerating motion, breaks the lateral magnetization symmetry between the two layers of the oscillator. Our results reveal the origin of the signal measured experimentally [N. Locatelli et al., Appl. Phys. Lett. 98, 062501 (2011)] for a system based on two coupled vortices and provide key insights into engineering the vortex core orientation using DC currents.