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.
Published Web Locationhttp://prb.aps.org/pdf/PRB/v83/i6/e060415
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.