Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Magnetization Dynamics IV
MA 38.3: Vortrag
Mittwoch, 16. März 2011, 15:15–15:30, HSZ 403
Fast and Selective Switching of the Vortex Core with Orthogonal Magnetic Pulses — •Matthias Noske1, Markus Weigand1, Bartel Van Waeyenberge2, Hermann Stoll1, Arne Vansteenkiste2, Matthias Kammerer1, Michael Curcic1, Markus Sproll1, Georg Woltersdorf3, and Gisela Schütz1 — 1MPI for Metals Research, Stuttgart — 2Department of Solid State Science, Ghent University, Belgium — 3Department of Physics, Regensburg University
Reliable, low-power and selective switching of the magnetic vortex core using rotating magnetic fields has been demonstrated by [1] and has potential application in vortex random access memory as discussed in [2]. However, when rotating RF magnetic fields are applied, the vortex will gyrate a few times before the core polarity switches and a few times after until it reaches the equilibrium position again. In contrast, orthogonal pulses can cause switching after less than one gyration period. Our micromagnetic simulations and experiments prove that the vortex core in sub-micron sized permalloy structures can be unequivocally and unidirectionally reversed by two carefully designed orthogonal magnetic in-plane pulses. Additionally, by tuning the length of the second pulse, the vortex displacement after switching can be minimized, effectively quenching the residual vortex motion. The time-resolved experiments were conducted at the newly installed scanning X-ray microscope MAXYMUS at BESSY II, Berlin.
[1] M. Curcic et al., Phys. Rev. Lett. 101, 197204 (2008)
[2] S.-K. Kim et al., Appl. Phys. Lett. 92, 022509 (2008)