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Disorder-induced microscopic magnetic memory.

  • Author(s): Pierce, M S
  • Buechler, C R
  • Sorensen, L B
  • Turner, J J
  • Kevan, S D
  • Jagla, E A
  • Deutsch, J M
  • Mai, T
  • Narayan, O
  • Davies, J E
  • Liu, K
  • Dunn, J Hunter
  • Chesnel, K M
  • Kortright, J B
  • Hellwig, O
  • Fullerton, E E
  • et al.
Abstract

Using coherent x-ray speckle metrology, we have measured the influence of disorder on major loop return point memory (RPM) and complementary point memory (CPM) for a series of perpendicular anisotropy Co/Pt multilayer films. In the low disorder limit, the domain structures show no memory with field cycling--no RPM and no CPM. With increasing disorder, we observe the onset and the saturation of both the RPM and the CPM. These results provide the first direct ensemble-sensitive experimental study of the effects of varying disorder on microscopic magnetic memory and are compared against the predictions of existing theories.

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