Physics – Condensed Matter – Materials Science
Scientific paper
2010-01-15
PHYSICAL REVIEW B 81, 054439 2010
Physics
Condensed Matter
Materials Science
18 pages, 11 figures
Scientific paper
10.1103/PhysRevB.81.054439
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 non-volatile 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.
Anguita J. V.
Asenjo Agustina
Chubykalo-Fesenko Oksana
de Lara Perez D.
Gonzalez Majorie E.
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