Magnetization reversal in nanodisks

Magnetization reversal by confined droplet growth in soft/hard hybrid nanodisks with perpendicular anisotropy.
J.-P. Adam, S. Rohart, J.-P. Jamet, J. Ferré, A. Mougin, R. Weil, H. Bernas, and G. Faini
Phys. Rev. B 85, 214417 (2012)

(a) Expected spontaneous magnetization M_s variation along the nanodisk radius. (b) PMOKE image difference between the remnant state after a magnetic field pulse (27 mT, 200 ns) and the remnant state after saturation under 500 mT during 5 s.