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Title: Microstructure evolution and magnetic properties of FeB/Pt multilayers and FeBPt composite films

Comparisons of microstructural evolution and magnetic properties were made of a FeB12/Pt10/[FeB1.2/Pt1]{sub 15}/Ta5 nm multilayered structure with a FeB12/Pt10/FeBPt33/Ta5 nm co-deposited structure. The Ta capping layer was used to protect the films from oxidation. Both these samples were sputtered in the same planetary deposition system onto thermally oxidized silicon substrates. They both represent layer-by-layer deposition, with the second type of deposition having atomically fine layers, more than an order of magnitude finer than the first type. The samples were annealed at a range of times, temperatures, and vacuum conditions. X-ray diffraction (XRD), transmission electron microscopy, and alternating gradient magnetometry were employed to characterize the structural and magnetic properties, respectively. Significant differences were observed between the two types of structures. A maximum coercivity of 8.9 kOe was seen for the atomically fine multilayer, about 10% more than that for the coarse multilayer. XRD analysis confirmed that both the coarse and fine multilayers were in the L1{sub 0} phase after annealing. Our results indicate that the co-deposited film, which is really composed of atomically fine multilayers, is superior to the coarse multilayered FeB/Pt for the formation of L1{sub 0}-phase FePt.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Center for Materials for Information Technology (MINT) The University of Alabama, Tuscaloosa, Alabama 35487 (United States)
  2. (United States)
  3. (MFF) The University of Alabama, Tuscaloosa, Alabama 35487 (United States)
  4. Central Analytical Facility (CAF), The University of Alabama, Tuscaloosa, Alabama 35487 (United States)
Publication Date:
OSTI Identifier:
22273846
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; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; DEPOSITION; HETEROJUNCTIONS; INTERFACES; IRON BORIDES; LAYERS; MAGNETIC PROPERTIES; MICROSTRUCTURE; OXIDATION; PLATINUM; SILICON; SPUTTERING; SUBSTRATES; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION