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Title: Equiatomic CoPt thin films with extremely high coercivity

In this paper, magnetic and structural properties of near-equiatomic CoPt thin films, which exhibited a high coercivity in the film-normal direction—suitable for perpendicular magnetic recording media applications—are reported. The films exhibited a larger coercivity of about 6.5 kOe at 8 nm. The coercivity showed a monotonous decrease as the film thickness was increased. The transmission electron microscopy images indicated that the as fabricated CoPt film generally consists of a stack of magnetically hard hexagonal-close-packed phase, followed by stacking faults and face-centred-cubic phase. The thickness dependent magnetic properties are explained on the basis of exchange-coupled composite media. Epitaxial growth on Ru layers is a possible factor leading to the unusual observation of magnetically hard hcp-phase at high concentrations of Pt.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Data Storage Institute, (A-STAR) Agency for Science, Technology and Research, DSI Building, 5, Engineering Drive 1, Singapore 117608 (Singapore)
  2. Western Digital Corporation, Singapore 638552 (Singapore)
Publication Date:
OSTI Identifier:
22273916
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; COERCIVE FORCE; CONCENTRATION RATIO; EPITAXY; FCC LATTICES; HCP LATTICES; INTERMETALLIC COMPOUNDS; LAYERS; MAGNETIC PROPERTIES; PLATINUM; RUTHENIUM; STACKING FAULTS; THICKNESS; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY