Effect of FePt-C nucleation layer on magnetic properties and nanostructure for FePt-C / FePt-oxide stacked media

Kim Kong Tham, Takashi Saito, Ryosuke Kushibiki, Shin Saito

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Magnetic properties and nanostructure for FePt-30vol%C (2 nm) / FePt-30vol%GBM (0-8 nm) stacked media was investigated. Following effects of the employment of FePt-C nucleation layer (NL) were confirmed: 1) Msave varies linearly against melting point (Tm) with value (500-600 emu/cm3) smaller than that of media without NL (500-750 emu/cm3) due to volume average of Msave for FePt-C and FePt-GBM granular layer, 2) There is no strong correlation between grain diameter (GD) and degree of ordering (Sinfilm) of the stacked media with Tm of the GBM, 3) Ku⊥film dependence on Sinfilm for media with NL shows similar behavior with that of without NL, 4) for media with the same total thickness, the smaller I110inplane for media with NL than that of without NL reveals that disorder portion in the media with NL increases, 5) the improvement of linearity in I110inplane for media with NL against total thickness suggests that the homogeneity of the media with is improved, 6) reduction of I001 inplane from XRD in-plane profile, reflected in l4θsat from the torque curve which suggests the reduction of the ratio of FePt grains with their c-axes parallel to the film plane. Further effort would be required to completely exclude the in-plane component.

Original languageEnglish
Title of host publication2021 IEEE International Magnetic Conference, INTERMAG 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9780738130996
DOIs
Publication statusPublished - 2021
Event2021 IEEE International Magnetic Conference, INTERMAG 2021 - Virtual, Online, France
Duration: 2021 Apr 262021 Apr 30

Publication series

NameDigests of the Intermag Conference
Volume2021-April
ISSN (Print)0074-6843

Conference

Conference2021 IEEE International Magnetic Conference, INTERMAG 2021
Country/TerritoryFrance
CityVirtual, Online
Period21/4/2621/4/30

Keywords

  • FePt-C
  • FePt-oxide
  • Heat assisted magnetic recording
  • L10 typed FePt
  • Nucleation layer
  • Stacked media

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