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Open Access Publications from the University of California

Vertically graded anisotropy in Co/Pd multilayers

  • Author(s): Kirby, Brian J.
  • Davies, J. E.
  • Liu, Kai
  • Watson, S. M.
  • Zimanyi, G. T.
  • Shull, R. D.
  • Kienzle, P. A.
  • Borchers, J. A.
  • et al.

Depth grading of magnetic anisotropy in perpendicular magnetic media has been predicted to reduce thefield required to write data without sacrificing thermal stability. To study this prediction, we have producedCo/Pd multilayers with depth-dependent Co layer thickness. Polarized neutron reflectometry shows that thethickness grading results in a corresponding magnetic anisotropy gradient. Magnetometry reveals that theanisotropy gradient promotes domain nucleation upon magnetization reversal - a clear experimental demonstrationof the effectiveness of graded anisotropy for reducing write field.

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