Journal
PHYSICAL REVIEW B
Volume 83, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.060415
Keywords
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Funding
- NSF [ECCS-0925626, ECCS-0725902, DMR-1008791]
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Reproducible control of the magnetic vortex state in nanomagnets is of critical importance. We report on chirality control by manipulating the sizeand/or thickness of asymmetric Co dots. Below a critical diameter and/or thickness, chirality control is achieved by the nucleation of a single vortex. Interestingly, above these critical dimensions, chirality control is realized by the nucleation and subsequent coalescence of two vortices, resulting in a single vortex with the opposite chirality as found in smaller dots. Micromagnetic simulations and magnetic force microscopy highlight the role of edge-bound half vortices in facilitating the coalescence process.
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