Observation of Magnetic Supercooling of the Transition to the Vortex State

Details Observation of Magnetic Supercooling of the Transition to the Vortex State Observation of Magnetic Supercooling of the Transition to the Vortex State

2010-04-12

arxiv.org/abs/1004.1857v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages preprint, 4 figures, accepted to New Journal of Physics

Scientific paper

We demonstrate that the transition from the high-field state to the vortex state in a nanomagnetic disk shows the magnetic equivalent of supercooling. This is evidence that this magnetic transition can be described in terms of a modified Landau first-order phase transition. To accomplish this we have measured the bulk magnetization of single magnetic disks using nanomechanical torsional resonator torque magnetometry. This allows observation of single vortex creation events without averaging over an array of disks or over multiple runs.

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