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Title: Origin of the spin reorientation transitions in (Fe{sub 1–x}Co{sub x}){sub 2}B alloys

Low-temperature measurements of the magnetocrystalline anisotropy energy K in (Fe{sub 1–x}Co{sub x}){sub 2}B alloys are reported, and the origin of this anisotropy is elucidated using a first-principles electronic structure analysis. The calculated concentration dependence K(x) with a maximum near x = 0.3 and a minimum near x = 0.8 is in excellent agreement with experiment. This dependence is traced down to spin-orbital selection rules and the filling of electronic bands with increasing electronic concentration. At the optimal Co concentration, K depends strongly on the tetragonality and doubles under a modest 3% increase of the c/a ratio, suggesting that the magnetocrystalline anisotropy can be further enhanced using epitaxial or chemical strain.
Authors:
 [1] ; ;  [2] ; ;  [3] ; ; ; ; ;  [2] ;  [4]
  1. Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)
  2. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22412616
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 6; Other Information: (c) 2015 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; ANISOTROPY; BORON ALLOYS; COBALT ALLOYS; CONCENTRATION RATIO; ELECTRONIC STRUCTURE; EPITAXY; IRON BASE ALLOYS; SELECTION RULES; SPIN; STRAINS; TEMPERATURE DEPENDENCE