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 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.
Highlights
The experimental observation of the magnetic vortex state in circular islands [1] has attracted substantial interest within the field of nanomagnetism [2,3,4,5,6,7,8,9]
Upon thermal annealing of individual cobalt islands grown on a ruthenium surface, Ding et al found that for certain sizes of the islands the magnetic state could be converted from a vortex state to a collinear state and vice versa [16]
Thermally active nano-patterned magnetic materials have recently gained a lot of interest [17,18,19,20,21], where elongated islands fluctuate between two collinear states, different only in the direction of the magnetization
Summary
The experimental observation of the magnetic vortex state in circular islands [1] has attracted substantial interest within the field of nanomagnetism [2,3,4,5,6,7,8,9]. The thermal fluctuations are sufficient for transitions between the vortex state and the collinear state, leading to a hysteresis-free switching. We utilize both the composition of the disks and the temperature to alter the energy landscape of the vortex/ collinear state and thereby control the region of bistability.
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