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Title: Tuning the Curie temperature of L1{sub 0} ordered FePt thin films through site-specific substitution of Rh

In structurally ordered magnetic thin films, the Curie temperature (T{sub C}) of ferromagnetic films depends on the exchange integral of the short range ordered neighboring atoms. The exchange integral may be adjusted by controlling the elemental substitutional concentration at the lattice site of interest. We show how to control the T{sub C} in high anisotropy L1{sub 0} Fe{sub 50}Pt{sub 50} magnetic thin films by substituting Rh into the Pt site. Rh substitution in L1{sub 0} FePt modified the local atomic environment and the corresponding electronic properties, while retaining the ordered L1{sub 0} phase. The analysis of extended x-ray Absorption Fine Structure spectra shows that Rh uniformly substitutes for Pt in L1{sub 0} FePt. A model of antiferromagnetic defects caused by controlled Rh substitution of the Pt site, reducing the T{sub C,} is proposed to interpret this phenomenon and its validity is further examined by ab initio density functional calculations.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3] ;  [4] ; ;  [5]
  1. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. (Singapore)
  3. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore)
  4. Data Storage Institute, Agency for Science, Technology and Research (A-STAR), Singapore 117608 (Singapore)
  5. Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala (Sweden)
Publication Date:
OSTI Identifier:
22305793
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 14; 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; ABSORPTION; ANISOTROPY; ANTIFERROMAGNETISM; ATOMS; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; CRYSTAL DEFECTS; CURIE POINT; DENSITY FUNCTIONAL METHOD; FINE STRUCTURE; IRON ALLOYS; PLATINUM ALLOYS; RHODIUM ADDITIONS; SPECTRA; THIN FILMS; X RADIATION