Electrical and Computer Engineering, Materials Science and Engineering, Ames Laboratory
Journal or Book Title
IEEE Transactions on Magnetics
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.
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Hadimani, Ravi L.; Gupta, S.; Harstad, S. M.; Pecharsky, Vitalij K.; and Jiles, David C., "Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd5Si4" (2015). Ames Laboratory Publications. 404.