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Effective anisotropy gradient in pressure graded [Co/Pd] multilayers

Authors
  • Kirby, B. J.
  • Greene, P. K.
  • Maranville, B. B.
  • Davies, J. E.
  • Liu, Kai
Type
Preprint
Publication Date
Mar 20, 2014
Submission Date
Mar 09, 2014
Identifiers
DOI: 10.1063/1.4908140
Source
arXiv
License
Yellow
External links

Abstract

A vertically graded anisotropy profile has been proposed as an optimized balance of low coercivity and thermal stability for multilayers used in magnetic media. Deposition pressure is known to have a profound effect on the magnetic reversal properties of Co/Pd multilayers, making it an attractive control parameter for achieving an anisotropy gradient. We have used polarized neutron reflectometry to study the depth-dependent reversal behavior of "pressure-graded" Co/Pd, and observed pronounced gradients in the saturation magnetization and in the rate at which magnetization changes with field (the effective anisotropy). While the anisotropy gradient likely arises from a combination of factors intrinsic to deposition pressure, micromagnetic simulations indicate that the observed saturation magnetization gradient alone has a major effect on the resulting coercivity.

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