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No.1(pp.1-39)

Home > Issues > Volume 10 (2005) > No.1(pp.1-39)

Magnetic and Ordering Behavior of Nb-doped FePt Alloy Films

Journal of Magnetics, Volume 10, Number 1, 31 Mar 2005, Pages 28-32

Min Kyu Kim(Division of Materials Science and Engineering, Korea University), Seong-Rae Lee*

(Division of Materials Science and Engineering, Korea University)

Abstract

The magnetic properties and ordering behavior of Nb-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. It was found that Nb addition retarded the ordering reaction from the disordered face-centered-cubic (fcc) Al phase to the ordered face-centered-tetragonal (fct) L1₀ phase. The tetragonality (c/a ratio) of the ordered fct L1₀ phase increased with the Nb concentration. Nb addition hampered c-axis contraction during ordering, probably because the larger Nb atoms occupy Pt sites. Consequently, the coercivity and magnetocrystalline anisotropic energy of Nb-doped FePt alloy films are lower than those of un-doped FePt film under equivalent annealing conditions.

Keywords: FePt alloy film; Nb-doping; magnetic properties; ordering transformation; microstructure

DOI:

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