Hysteresis-free switching between vortex and collinear magnetic states

Author: Erik Östman; Unnar B Arnalds; Emil Melander; Vassilios Kapaklis; Gunnar K Pálsson; Alexander Y Saw; Marc A Verschuuren; Florian Kronast; Evangelos Th Papaioannou; Charles S Fadley; Björgvin Hjörvarsson; Uppsala Universitet; []

Keywords: NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

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 (Te) 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.

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