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Journal of Applied Physics / Volume 85 / Issue 5 / CONDENSED MATTER: ELECTRICAL AND MAGNETIC PROPERTIES (PACS 71-76)

J. Appl. Phys. 85, 2775 (1999); doi:10.1063/1.369593 (7 pages)

Effects of stacking faults on magnetic viscosity in thin film magnetic recording media

P. Dova1, H. Laidler1, K. O’Grady1, M. F. Toney2, and M. F. Doerner3

1Magnetic Materials Research Group, SEECS, University of Wales, Bangor, Gwynedd LL57 1UT, United Kingdom
2IBM Almaden Research Center, San José, California 95120
3IBM Storage Systems Division, San José, California 95193

(Received 16 September 1998; accepted 11 November 1998)

There is much interest in crystallographic defects in thin film magnetic recording media and their role in influencing recording performance such as media noise and thermal loss. In this article we report a correlation between the magnetic viscosity in CoPtCr thin film media, which is the origin of thermal loss effects, and the concentration of local fcc-like regions. The concentration of these defects (the type and density of stacking faults) was varied by growth on different underlayers (Cr and CrTa/Cr) and was measured with grazing incidence x-ray scattering using synchrotron radiation. We show that a substantial percentage of local fcc regions in an otherwise hcp cobalt alloy film leads to significant magnetic viscosity effects at quite modest magnetic fields. We find that the activation volume is reduced for a sample with a higher percentage of fcc-like regions and suggest that this can be understood in terms of the effect of weak links acting to stabilize local micromagnetic configurations. © 1999 American Institute of Physics.

© 1999 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, platinum alloys, chromium alloys, magnetic thin films, magnetic recording, stacking faults

PACS

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 75.50.Ss

    Magnetic recording materials

  • 61.72.Nn

    Stacking faults and other planar or extended defects

  • 68.55.Ln

    Defects and impurities: doping, implantation, distribution, concentration, etc.

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.369593

PUBLICATION DATA

ISSN:

0021-8979 (print)  
1089-7550 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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