%0 Journal Article
%A Jaafar, M.
%A Yanes,, R.
%A Pérez de Lara, D.
%A Chubykalo Fesenko, O.
%A Asenjo, A.
%A González Herrera, Elvira María
%A Anguita, J. V.
%A Vazquez, V.
%A Vicent López, José Luis
%T Control of the chirality and polarity of magnetic vortices in triangular nanodots
%D 2010
%@ 1098-0121
%U https://hdl.handle.net/20.500.14352/42679
%X Magnetic vortex dynamics in lithographically prepared nanodots is currently a subject of intensive research, particularly after recent demonstration that the vortex polarity can be controlled by in-plane magnetic field. This has stimulated the proposals of nonvolatile vortex magnetic random access memories. In this work, we demonstrate that triangular nanodots offer a real alternative where vortex chirality, in addition to polarity, can be controlled. In the static regime, we show that vortex chirality can be tailored by applying in-plane magnetic field, which is experimentally imaged by means of variable-field magnetic force microscopy. In addition, the polarity can be also controlled by applying a suitable out-of-plane magnetic field component. The experiment and simulations show that to control the vortex polarity, the out- of-plane field component, in this particular case, should be higher than the in-plane nucleation field. Micromagnetic simulations in the dynamical regime show that the magnetic vortex polarity can be changed with short-duration magnetic field pulses, while longer pulses change the vortex chirality.
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