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Tuning perpendicular anisotropy gradient in Co/Pd multilayers by ion irradiation

  • Author(s): Greene, PK
  • Osten, J
  • Lenz, K
  • Fassbender, J
  • Jenkins, C
  • Arenholz, E
  • Endo, T
  • Iwata, N
  • Liu, K
  • et al.

Published Web Location

https://doi.org/10.1063/1.4893569
Abstract

The tunability of Ar+ ion irradiation of Co/Pd multilayers has been employed to create depth-dependent perpendicular anisotropy gradients. By adjusting the Ar+ kinetic energy and fluence, the depth and lateral density of the local structural modification are controlled. First-order reversal curve analysis through X-ray magnetic circular dichroism and conventional magnetometry studies shows that the local structural damage weakens the perpendicular anisotropy near the surface, leading to a magnetization tilting towards the in-plane direction. The ion irradiation method is complementary to and may be used in conjunction with, other synthesis approaches to maximize the anisotropy gradient. © 2014 AIP Publishing LLC.

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