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Title: Granular nanostructures and magnetic characteristics of FePt-TiO{sub 2}/FePt-C stacked granular films

To realize a granular film composed of L1{sub 0}-FePt grains with high uniaxial magnetic anisotropy energy, K{sub u}, and segregants for heat-assisted magnetic recording, the FePt-TiO{sub 2}/FePt-C stacked film was investigated. The FePt-TiO{sub 2}/FePt-C stacked film has well-isolated granular structure with average grain size of 6.7 nm because the FePt-TiO{sub 2} film follows the FePt-C template film in microstructural growth. However, the K{sub u} value is quite low for total thickness of 9 nm: 5 × 10{sup 6} erg/cm{sup 3}. Exploration of the thickness dependence of L1{sub 0}-FePt(001) peaks in XRD spectra and cross-sectional TEM images suggest that degradation of the L1{sub 0} ordering appears near the middle of the FePt-TiO{sub 2} layer. The EDX-STEM mapping reveals that Ti atoms exist within the FePt grains in addition to the grain boundary. This indicates the possibility that TiO{sub 2} tends to be incorporated into the FePt grains and that it prevents L1{sub 0}-ordering of the FePt grains along the normal-to-plane direction.
Authors:
;  [1] ;  [2] ;  [3] ; ; ;  [4] ;  [3] ;  [5]
  1. Fuji Electric Co. Ltd., Tokyo 191-8502 (Japan)
  2. (FRIS), Tohoku University, Miyagi 980-8578 (Japan)
  3. Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Miyagi 980-8578 (Japan)
  4. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Miyagi 980-8577 (Japan)
  5. (RIEC), Tohoku University, Miyagi 980-8577 (Japan)
Publication Date:
OSTI Identifier:
22273893
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; GRAIN BOUNDARIES; GRAIN SIZE; IMAGES; INTERFACES; INTERMETALLIC COMPOUNDS; IRON; LAYERS; NANOSTRUCTURES; PLATINUM; THICKNESS; THIN FILMS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY SPECTRA