Hysteresis-free switching between vortex and collinear magnetic states

Abstract

We demonstrate a lossless switching between vortex and collinear magnetic states in circular FePd disks arranged in a square lattice. Above a bifurcation temperature $\left( {{T}_{\text{e}}} \right)$ we show that thermal fluctuations are enough to facilitate flipping between the two distinctly different magnetic states. We find that the temperature dependence of the vortex annihilation and nucleation fields can be described by a simple power law relating them to the saturation magnetization.

Keywords

• magnetic nanostructures
• magnetic vortices
• thermal fluctuations