期刊
APPLIED PHYSICS LETTERS
卷 106, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4915308
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资金
- Foundation for Author of National Excellent Doctoral Dissertation [201037]
- 973 Program [2012CB619401]
- SRF for ROCS, SEM
- [JSPS-P11509]
Soluting rare earth atoms Tb or Dy into body centered cubic (BCC) Fe-Ga through rapid cooling significantly enhances the magnetostriction due to strong localized magnetocrystalline anisotropy. Origin of the local strong anisotropy, however, awaits comprehensive microstructural investigation. In this letter, formation of tetragonal nanoparticles with c/a similar to 0.979 has been found in the giant magnetostrictive ribbons Fe82.89Ga16.88Tb0.23 due to local symmetry breaking of the BCC lattice using high resolution transmission electronic microscopy. First principal calculations suggest that random replacement of Tb atoms for Fe or Ga in the ordered DO3 superlattice is beneficial in the formation of such tetragonal symmetry. Exchange couplings between the nearest Tb-Fe or Tb-Tb pairs of the tetragonal nanoparticles might generate strong localized magnetocrystalline anisotropy, leading to extraordinary magnetostriction enhancement. (C) 2015 AIP Publishing LLC.
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