Nanostructure and magnetic properties of L10 FePt:X films

Tom A. George, Zhen Li, Minglang Yan, Yingfan Xu, Ralph Skomski, David J. Sellmyer

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Abstract

Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePtX]n and have individual thicknesses from about 0.06 to 1.1 nm. To create an (001)-oriented granular L 10 structure, the films are then annealed at temperatures of 600 °C for 5 min and 550 °C for 10 min. The data indicate that Cu enters the L 10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10 kOe, and slopes α= (dMdH) Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.

Original languageEnglish (US)
Article number07D502
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
Publication statusPublished - Apr 21 2008

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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