Title :
Ferrimagnetic zinc ferrite fine powders
Author :
Hamdeh, H.H. ; Ho, J.C. ; Oliver, S.A. ; Willey, R.J. ; Kramer, J. ; Chen, Y.Y. ; Lin, S.H. ; Yao, Y.D. ; Daturi, M. ; Busca, G.
Author_Institution :
Dept. of Phys., Wichita State Univ., KS, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
Partially inverted fine powders of zinc ferrite (ZnFe2O 4) were produced by chemical aerogel synthesis. These powders showed magnetic ordering at temperatures to 250 K. Upon ball milling, a much higher inversion parameter was attained, yielding ferrimagnetic powders having small remanence and coercive fields at room temperature. Due to the small mean particle size, superparamagnetic behavior was seen at temperatures above 25 K. Powder properties were characterized by X-ray diffraction, electron microscopy, calorimetry, magnetometry, and Mossbauer effect spectroscopy techniques
Keywords :
Mossbauer effect; coercive force; ferrites; magnetic particles; powder technology; remanence; superparamagnetism; zinc compounds; Mossbauer spectroscopy; X-ray diffraction; ZnFe2O4; ball milling; calorimetry; chemical aerogel synthesis; coercive field; electron microscopy; ferrimagnetic fine powders; inversion parameter; magnetic ordering; magnetometry; particle size; remanence; superparamagnetism; zinc ferrite; Ball milling; Chemicals; Ferrimagnetic materials; Ferrites; Magnetic properties; Powders; Remanence; Temperature; X-ray diffraction; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
