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Title: Large magneto-chemical-elastic coupling in highly magnetostrictive Fe-Ga alloys

The strong softening of the tetragonal shear elastic constant (C{sup ′}) is the main reason for the second magnetostriction peak observed in Fe{sub 100–x}Ga{sub x} alloys. Here, we study the coupling between chemical order and magnetism with the aim to understand the origin of the elastic softening. We demonstrate that C{sup ′} strongly depends on the degree of order of Ga atoms in α-Fe. The B{sub 2} type ordering proves to have an important role on the elastic softening for x<19%, whereas the extreme shear lattice softening and the anomalous temperature dependence of C{sup ′} are found to be due to the strong magnetochemical coupling in the DO{sub 3} phase.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [3] ;  [4]
  1. Applied Materials Physics, Department of Material Science and Engineering, Royal Institute of Technology, Stockholm 100 44 (Sweden)
  2. (China)
  3. (Sweden)
  4. (Hungary)
Publication Date:
OSTI Identifier:
22253921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; ATOMS; COUPLING; MAGNETISM; MAGNETOSTRICTION; ORIGIN; PEAKS; SHEAR; TEMPERATURE DEPENDENCE