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Chirality control via double vortices in asymmetric Co dots

  • Author(s): Dumas, Randy K.
  • Gilbert, Dustin A.
  • Eibagi, Nasim
  • Liu, Kai
  • Advisor(s): Liu, Kai
  • et al.
Abstract

Reproducible control of the magnetic vortex state in nanomagnets is of critical importance. We report onchirality control by manipulating the size and/or thickness of asymmetric Co dots. Below a critical diameterand/or thickness, chirality control is achieved by the nucleation of a single vortex. Interestingly, above thesecritical 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 andmagnetic force microscopy highlight the role of edge-bound half vortices in facilitating the coalescence process.

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