Chirality control via double vortices in asymmetric Co dots

Details Chirality control via double vortices in asymmetric Co dots Chirality control via double vortices in asymmetric Co dots

2010-08-29

arxiv.org/abs/1008.4963v2

Physical Review B 83, 060415(R) (2011)

Physics

Condensed Matter

Materials Science

15 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.060415

Reproducible control of the magnetic vortex state in nanomagnets is of critical importance. We report on chirality control by manipulating the size and/or thickness of asymmetric Co dots. Below a critical diameter and/or thickness, chirality control is achieved by the nucleation of 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 halfvortices in facilitating the coalescence process.

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