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The Influence of Microstructure on the Magnetic Properties in Nanostructured Copt L10 Thin Films

Published online by Cambridge University Press:  21 February 2011

S. Jeong ,
M.E. Mchenry  and
D.E. Laughlin
S. Jeong
Affiliation:
Data Storage Systems Center, MSE Department, Carnegie Mellon University, Pittsburgh, PA, [email protected]
M.E. Mchenry
Affiliation:
Data Storage Systems Center, MSE Department, Carnegie Mellon University, Pittsburgh, PA, 15213
D.E. Laughlin
Affiliation:
Data Storage Systems Center, MSE Department, Carnegie Mellon University, Pittsburgh, PA, 15213
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Abstract

We have applied the Neel's spin pair potential model to model the dependence of magnetocrystalline anisotropy on the long range order parameter. We have produced CoPt nanoscale thin films, with and without an immiscible second phase, by RF and DC magnetron sputtering. These thin films showed a shoulder in their magnetic hysteresis, indicative of a disordered soft magnetic phase for samples annealed above 600 °C while it was barely detectable in 500-600 °C annealed samples. A (111) texture is observed in as-deposited and annealed films is identified as one of the possible contributions to the lower coercivity squareness S* and perpendicular magnetic properties. Micromagnetic calculations confirmed a poor exchange interaction, identified rotational energy barriers and inferred that the ordered region was not fully ordered. The initial stage of ordering clearly showed a discontinuous type transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 365
Copyright
Copyright © Materials Research Society 1999

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