Journal
PHYSICAL REVIEW B
Volume 81, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.054439
Keywords
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Funding
- Spanish Ministerio Ciencia e Innovacion [FIS2008-06249, MAT2007-66719-C03-01, MAT2007-65420-C02-01]
- Consolider [CSD2007-00010, CS2008-023]
- CAM [S2009/MAT1726, S2009/MAT-1467, S-0505/ESP/0337, 505/MAT/0194]
- Santander-UCM [GR58/08]
- Fondo Social Europeo
- CSIC
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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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