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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.
Authors:
 [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:
Report Number(s):
IS-J-8668
Journal ID: ISSN 0018-9464; PII: S0368204814001571
Grant/Contract Number:
CSR-KN/CRS-22; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 51; Journal Issue: 11; Journal ID: ISSN 0018-9464
Publisher:
Institute of Electrical and Electronics Engineers. Magnetics Group
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; contrast agents; gadolinium nanoparticles; magnetocaloric nanoparticles; room temperature ferromagnetic nanoparticles
OSTI Identifier:
1227400

Hadimani, R. L., Gupta, S., Harstad, S. M., Pecharsky, V. K., and Jiles, D. C.. Investigation of room temperature ferromagnetic nanoparticles of Gd5Si4. United States: N. p., Web. doi:10.1109/TMAG.2015.2446774.
Hadimani, R. L., Gupta, S., Harstad, S. M., Pecharsky, V. K., & Jiles, D. C.. Investigation of room temperature ferromagnetic nanoparticles of Gd5Si4. United States. doi:10.1109/TMAG.2015.2446774.
Hadimani, R. L., Gupta, S., Harstad, S. M., Pecharsky, V. K., and Jiles, D. C.. 2015. "Investigation of room temperature ferromagnetic nanoparticles of Gd5Si4". United States. doi:10.1109/TMAG.2015.2446774. https://www.osti.gov/servlets/purl/1227400.
@article{osti_1227400,
title = {Investigation of room temperature ferromagnetic nanoparticles of Gd5Si4},
author = {Hadimani, R. L. and Gupta, S. and Harstad, S. M. and Pecharsky, V. K. and Jiles, D. C.},
abstractNote = {Gd5(SixGe1-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-Gd5Si4-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.},
doi = {10.1109/TMAG.2015.2446774},
journal = {IEEE Transactions on Magnetics},
number = 11,
volume = 51,
place = {United States},
year = {2015},
month = {7}
}