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The relationship between interface structure, conformality and perpendicular anisotropy in CoPd multilayers.

A S H Rozatian1, C H Marrows, T P A Hase

  • 1Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 22, 2011
PubMed
Summary
This summary is machine-generated.

Interface structure significantly impacts perpendicular anisotropy in cobalt/palladium multilayers. Non-conformal roughness increases with thickness, potentially reducing anisotropy energy.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Cobalt/palladium (Co/Pd) multilayers are crucial for magnetic storage technologies.
  • Understanding interface structure is key to optimizing magnetic properties like perpendicular anisotropy.

Purpose of the Study:

  • To investigate the relationship between interface structure and perpendicular anisotropy in sputtered Co/Pd multilayers.
  • To quantify how interface morphology changes with the number of Co/Pd bilayers.

Main Methods:

  • Grazing incidence x-ray scattering (GIXS) to probe interface structure.
  • Vibrating sample magnetometry (VSM) to measure magnetic anisotropy.
  • Analysis using a self-affine fractal model for interface characterization.

Main Results:

  • Interface roughness becomes non-conformal as the number of bilayers increases.
  • In-plane correlation length of roughness follows a power-law dependence on multilayer thickness.
  • A decrease in fractal dimension correlates with an increase in surface anisotropy.

Conclusions:

  • Loss of interface conformality, indicated by short out-of-plane correlation, may explain reduced anisotropy energy at higher bilayer counts.
  • Interface fractal dimension is weakly associated with anisotropy, but lower fractal dimensions suggest higher surface anisotropy.