Grain density control in FePt granular films for heat-assisted magnetic recording media

I. Suzuki, Y. K. Takahashi*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

To realize high areal density, hard disk drives larger than 4 Tbit in−2, ultrafine FePt grains of less than 5 nm and grain density larger than 24 T in−2 are required. Although there have been many investigations to reduce the grain size of FePt, there are only a few reports on the control of grain density. To increase the grain density, we focused on three aspects of the surface morphology and grain density: nucleation sites on the substrate surface, surface free energy, and lattice mismatch. We achieved 14 T in−2 by maximizing the number of nucleation sites in the FePt-C granular film and found that the surface free energy and lattice mismatch are crucial parameters for controlling the grain density.

Original languageEnglish
Article numberSB0801
JournalJapanese journal of applied physics
Volume62
Issue numberSB
DOIs
Publication statusPublished - 2023 Mar 1
Externally publishedYes

Keywords

  • FePt
  • grain density
  • magnetic recording
  • microstructure

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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