Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Spin Dynamics and Transport: Spin Excitations and Spin Torque Phenomena
MA 48.12: Vortrag
Donnerstag, 23. März 2017, 12:30–12:45, HSZ 101
Electrically detected magnetic vortex dynamics in Permalloy disks — •Lakshmi Ramasubramanian1,2, Ciarán Fowley1, Attila Kákay1, Oguz Yildirim1, Patrick Matthes4, Jürgen Lindner1, Jürgen Fassbender3, Sibylle Gemming1,2, Stefan E. Schulz2,4, and Alina M. Deac1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Technische Universität Chemnitz, 09126 Chemnitz, Germany — 3Institute for Physics of Solids, TU Dresden, 01069 Dresden, Germany — 4Fraunhofer Institute for Electronic Nano Systems, 09126 Chemnitz
The magnetic vortex is a potential candidate for future spintronic devices, like frequency sensors [S. Kasai, et al. PRL 97, 107204 (2006)] [R. Moriya, et al. Nat. Phys. 4:368 (2008)], spin torque oscillators [V. S. Pribiag, et al. Nat. Phys. 3:498 (2007)], and tunable magnonic crystals [J. Shibata, et al. PRB 67, 224404 (2003)]. The fundamental frequency is determined by the saturation magnetisation, as well as the geometrical confinement of the magnetisation i.e. the diameter and height of a magnetic disk. In this study, Permalloy disks (with radii ranging from 500nm to 4000nm) are patterned and contacted to study the interaction of spin polarized current on the magnetic vortex. The presence of vortex is verified by magneto optic Kerr effect, X-ray photoemission electron microscopy and magnetotransport measurements. The resonance frequency is measured using a lock-in technique based on the anisotropic magnetoresistance effect. Modification of the resonance frequency by ion irradiation will be presented.