DocumentCode
3603510
Title
Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd5Si4
Author
Hadimani, R.L. ; Gupta, S. ; Harstad, S.M. ; Pecharsky, V.K. ; Jiles, D.C.
Author_Institution
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Volume
51
Issue
11
fYear
2015
Firstpage
1
Lastpage
4
Abstract
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. Magnetization at a high temperature of 275 K decreases with the increase in the milling time.
Keywords
ball milling; coercive force; crystal microstructure; crystal structure; gadolinium alloys; germanium alloys; magnetic particles; magnetic transitions; nanofabrication; nanomagnetics; nanoparticles; silicon alloys; Gd5(SixGe1-x)4; coercivity; crystal structure; ferromagnetic nanoparticles; first-order phase transition; high-energy ball milling; long milling times; magnetic phase transition; magnetic properties; microstructures; nanoparticle fabrication; temperature 275 K; temperature 293 K to 298 K; Iron; Magnetization; Milling; Nanoparticles; Powders; Temperature; X-ray scattering; Contrast agents; Gadolinium nanoparticles; magnetocaloric nanoparticles; room temperature ferromagnetic nanoparticles;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2015.2446774
Filename
7150392
Link To Document