Non-linear vortex dynamics and transient effects in ferromagnetic disks

Details Non-linear vortex dynamics and transient effects in ferromagnetic disks Non-linear vortex dynamics and transient effects in ferromagnetic disks

2009-01-07

arxiv.org/abs/0901.0864v1

Physics

Condensed Matter

Materials Science

11 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

We report a time resolved imaging and micromagnetic simulation study of the relaxation dynamics of a magnetic vortex in the non-linear regime. We use time-resolved photoemission electron microscopy and micromagnetic calculations to examine the emergence of non-linear vortex dynamics in patterned Ni80Fe20 disks in the limit of long field pulses. We show for core shifts beyond ~20-25% of the disk radius, the initial motion is characterized by distortions of the vortex, a transient cross-tie wall state, and instabilities in the core polarization that influence the core trajectories.

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