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Title: Spin-orbit interaction tuning of perpendicular magnetic anisotropy in L1{sub 0} FePdPt films

The dependence of perpendicular magnetic anisotropy K{sub u} on spin-orbit coupling strength ξ is investigated in L1{sub 0} ordered FePd{sub 1−x}Pt{sub x} films by time-resolved magneto-optical Kerr effect measurements and ab initio density functional calculations. Continuous tuning of K{sub u} over a wide range of magnitude is realized by changing the Pt/Pd concentration ratio, which strongly modifies ξ but keeps other leading parameters affecting K{sub u} nearly unchanged. Ab initio calculations predict a nearly quadratic dependence of K{sub u} on ξ, consistent with experimental data. K{sub u} increases with increasing chemical order and decreasing thermal spin fluctuations, which becomes more significant for samples with higher Pt concentration. The results demonstrate an effective method to tune K{sub u} utilizing its sensitivity on ξ, which will help fabricate magnetic systems with desirable magnetic anisotropy.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4]
  1. Department of Applied Science, College of William and Mary, 251 Jamestown Road, Williamsburg, Virginia 23187 (United States)
  2. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092 (China)
  3. Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
  4. Department of Optical Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China)
Publication Date:
OSTI Identifier:
22273428
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; CONCENTRATION RATIO; DENSITY FUNCTIONAL METHOD; FLUCTUATIONS; IRON; KERR EFFECT; L-S COUPLING; PALLADIUM; PLATINUM; SPIN; THIN FILMS; TIME RESOLUTION; TUNING