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V. Giap, R. Sato Turtelli, N. Hanh, D. Linh, M. Reissner, H. Michor, J. Fidler, G. Wiesinger, R. Grössinger:
"Magnetic properties of nanocrystalline Co_1-xZn_xFe₂O₄ prepared by forced hydrolysis method";
Journal of Magnetism and Magnetic Materials, 307 (2006), S. 313 - 317.

Magnetic properties of nanocrystalline Co_1-xZn_xFe₂O₄ prepared by forced hydrolysis method

Giap.V. Duong a, b, R. Sato Turtelli b, N. Hanh a, D.V. Linh a, M. Reissner b, H. Michor b, J. Fidler b, G. Wiesinger b and R. Grössinger b

a Faculty of Chemical Engineering, Hanoi University of Technology, No.1 Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam
b Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria

Abstract

Nanocrystalline zinc-substituted cobalt ferrite powders, Co_1-xZn_xFe₂O₄ (x=0, 0.2, 0.4), were for the first time prepared by forced hydrolysis method. Magnetic and structural properties in these specimens were investigated. The average crystallite size is about 3.0 nm. When the zinc substitution increases from x=0 to x=0.4, at 4.2 K, the saturation magnetization increases from 72.1 to 99.7 emu/g and the coercive field decreases from 1.22 to 0.71 T. All samples are superparamagnetic at room temperature and ferrimagnetic at temperatures below the blocking temperature. The high value of the saturation magnetization and the very thin thickness of the disorder surface layer of all samples suggests that this forced hydrolysis method is suitable not only for preparing two metal element systems but also for three or more ones.

Keywords: Fine particles; Ferrite; Superparamagnetism; Forced hydrolysis method; Hysteresis loops

Fine particles; Ferrite; Superparamagnetism; Forced hydrolysis method; Hysteresis loops

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588065

http://dx.doi.org/10.1016/j.jmmm.2006.03.072