Magnetization reversal by confined droplet growth in soft/hard hybrid nanodisks with perpendicular anisotropy

  • Adam J
  • Rohart S
  • Jamet J
 et al. 
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Magnetization reversal dynamics in single perpendicular Pt/Co/Pt high
aspect ratio nanodisks have been studied by polar magneto-optical
Kerr effect microscopy. The He + ion process used to pattern these
nanodisks resulted in a soft/hard nanodisk structure. The energy
barrier field dependence was determined from the simple exponential
variation of the nonswitching probability with time. The standard
coherent reversal scenario fails to account for it whereas a two-dimensional-confined
droplet model supports the experimental observations. From a ring
shaped metastable domain wall in the magnetically soft outer ring,
the reversal progresses via the deformation of the domain wall and
the expansion of a reversed confined droplet through the nanodisk
hard core. This magnetic reversal, governed by domain wall propagation
alone, ensures a magnetization reversal reproducibility from nanodisk
to nanodisk and the very narrow energy barrier distribution observed.
© 2012 American Physical Society.

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