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Title: Investigation of room temperature ferromagnetic nanoparticles of Gd 5Si 4

Gd 5(Si xGe 1-x) 4 compounds undergo first-order phase transitions close to room temperature when x ~ = 0.5, which are accompanied by extreme changes of properties. We report the fabrication of the nanoparticles of one of the parent compounds-Gd 5Si 4-using high-energy ball milling. Crystal structure, microstructure, and magnetic properties have been investigated. Particles agglomerate at long milling times, and the particles that are milled >20 min lose crystallinity and no longer undergo magnetic phase transition close to 340 K, which is present in a bulk material. The samples milled for >20 min exhibit a slightly increased coercivity. As a result, magnetization at a high temperature of 275K decreases with the increase in the milling time.
 [1] ;  [2] ;  [3] ;  [1] ;  [3]
  1. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Iowa State Univ., Ames, IA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0018-9464; PII: S0368204814001571
Grant/Contract Number:
CSR-KN/CRS-22; AC02-07CH11358
Accepted Manuscript
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 51; Journal Issue: 11; Journal ID: ISSN 0018-9464
Institute of Electrical and Electronics Engineers. Magnetics Group
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; contrast agents; gadolinium nanoparticles; magnetocaloric nanoparticles; room temperature ferromagnetic nanoparticles