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Title: In-situ studies of large magnetostriction in DyCo 2 compound by synchrotron-based high-energy X-ray diffraction

Synchrotron-based high-energy X-ray diffraction is used to explore the physical origin of large magnetostriction in DyCo 2, an RT 2 compound (R = rare earth, T = Co, Fe), by tracing the crystal structural change as a function of temperature and magnetic field. When the DyCo 2 compound is zero-field cooled down below the Curie temperature T C, the high-temperature cubic lattice is distorted into a tetragonal structure, associated with an expansion of unit cell volume. When a magnetic field is applied gradually from 0 to 6 T below T C, no changes in the peak positions for tetragonal (800) T and (008) T peaks are observed, whereas their relative peak intensities are gradually changed. The intensity changes generated during magnetic field increasing are reversed stepwise with decreasing the magnetic field. Our experimental results suggest that the large magnetostriction in DyCo 2 is caused by the crystallographic domain-switch mechanism (or rearrangement of tetragonal domains). In conclusion, the diffraction elastic strain is not detected under the field up to 6 T. The present investigations provide a fundamental understanding of the mechanisms of the large magnetostriction in RT 2 compounds with Laves phases.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3]
  1. Beijing Institute of Technology, Beijing (China)
  2. Xi'an Jiaotong Univ., Xi'an (China)
  3. Univ. of Science and Technology Beijing, Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Northern Illinois Univ., DeKalb, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 724; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnetostriction; Domain switching; Diffraction elastic strain; High-energy X-ray diffraction; DyCo2
OSTI Identifier:
1460087