Sol-Gel Synthesis and Magnetic Properties of CoFe2-xRExO4(RE=Tb,Dy) Nanocrystalline Films

Abstract

Abstract: The nanocrystalline thin films of CoFe_2-xRE_xO₄(RE=Tb,Dy) were fabricated by sol-gel processing. By varying the doping content of rare earth ions, x, and the annealing conditions, the difficult crystallization of spinel phase was found for the samples with x>0.3, which is ascribed to te large radii of rare earth ions. AFM observation indicated that the grain size can be controlled between 20～50 nm and the sol-gel derived thin films have a surface with a low roughness of 4～5 nm. The doping of Tb³⁺and Dy³⁺ions inside spinel can enhance the coercive force of CoFe₂O₄films.

Key words: Cobalt spinel, Doping, Nanocrystalline films, Sol-gel processing

CLC Number:

O482.5

TrendMD:

CHENG Fu-Xiang, KUANG Jun-Feng, LIAO Chun-Sheng, XU Zhi-Gang, YAN Chun-Hua . Sol-Gel Synthesis and Magnetic Properties of CoFe_2-xRE_xO₄(RE=Tb,Dy) Nanocrystalline Films[J]. Chem. J. Chinese Universities, 1999, 20(4): 503.

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Sol-Gel Synthesis and Magnetic Properties of CoFe_2-xRE_xO₄(RE=Tb,Dy) Nanocrystalline Films

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