A comparative analysis of Ag and Cu heat sink layers in L10-FePt films for heat-assisted magnetic recording

Robert Fernandez, Desalegne Teweldebrhan, Chen Zhang, Alexander Balandin, Sakhrat Khizroev

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The magnetic properties, structural properties, and thermal conductivity of FePt films deposited on Ag and Cu heat sink layers designed for use in heat-assisted magnetic recording (HAMR) were investigated. It has been found that FePt films grown on Cu have a well-defined L10-FePt (001) texture while the FePt films grown on Ag appear to be more isotropic. As the thickness of the heat sink layer increases from 15 to 120 nm the coercivity of the FePt films decreases from 1.7 to 1.5 T for Cu and from 1.3 to 1.0 T for Ag. The thermal conductivity measurements, carried out with the laser-flash technique, revealed that the overall thermal resistance of the examined structures is dominated by the thermal boundary resistance and the interface effects. The increase in the thickness of Ag and Cu heat sink layers does not lead to the higher effective thermal conductivity of the layered structure in the cross-plane direction. The obtained results are important for optimization of the FePt-based structures for HAMR.

Original languageEnglish (US)
Article number07B763
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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