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Title: Influence of surface segregation on magnetic properties of FePt nanoparticles

Surface segregation leads to chemical disordering in magnetic alloy nanostructures and thus could have profound impact upon the magnetic properties of these nanostructures. In this study, we used the first-principles density functional theory calculation method to determine how Pt surface segregation (exchanging interior Pt with surface Fe atoms) would affect the magnetic properties of L1{sub 0} ordered FePt nanoparticles. For both cuboid and cuboctahedral FePt nanoparticles, we predicted that the Pt surface segregation process could cause a decrease in total magnetic moments, a change in (easy and/or hard) magnetization axes, and a reduction in magnetic anisotropy.
Authors:
 [1] ;  [2] ; ; ;  [1]
  1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261 (United States)
  2. (China)
Publication Date:
OSTI Identifier:
22217970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 13; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; ANISOTROPY; ATOMS; DENSITY FUNCTIONAL METHOD; IRON ALLOYS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETIZATION; NANOSTRUCTURES; PLATINUM ALLOYS; REDUCTION; SEGREGATION; SURFACES