Browse > Article
http://dx.doi.org/10.4283/JKMS.2005.15.3.186

Annealing Effects on Al0.2CoFe1.8O4 Ferrite Film and Powder  

Chae, Kwang-Pyo (Department of Applied Physics, Konkuk University)
Lee, Jae-Gwang (Department of Applied Physics, Konkuk University)
Kweon, Hyuck-Su (Department of Applied Physics, Konkuk University)
Kim, Jung-Hoon (Department of Applied Physics, Konkuk University)
Lee, Young-Bae (Department of Physics, Tonghae University)
Abstract
The $Al_{0.2}CoFe_{1.8}O_4$ ferrite films and powders were prepared by the sol-gel method. The crystallographic and magnetic properties of the samples were examined with annealing temperature by X-ray diffraction, $M\ddot{o}ssbauer$ spetroscopy and vibrating sample magnetometry. The powder samples showed the presence of spinel structure at annealing temperatures above 673 K, while the film samples indicated the spinel structure above 873 K, also the particle size increased with rising annealing temperatures. The $M\ddot{o}ssbauer$ spectra of $Al_{0.2}CoFe_{1.8}O_4$ powder annealed above 873 K could be fitted as the superposition of two Zeeman sextets due to ferrimagnetic phase. And the spectra of annealed at 673 K exhibited the superposition of ferrimanetic and paramagnetic phase and those of annealed at 473 K showed only a paramagnetic phase. The magnetic behaviour of powders appeared that the coercivity increased until annealed at 673 K but decreased above this temperature. The coercivity of the film samples decreased from 1.084 kOe at 873 K to 0.540 kOe at 1073 K with increasing annealing temperatures.
Keywords
Co ferrite; sol gel method; coercivity; VSM;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K.P. Chae, Y.B Lee, J.G. Lee, and S.H. Lee, J. Magn. Magn. Mater, 220, 59(2000)   DOI   ScienceOn
2 C. Yan, F. Cheng, et al., J. Appl. Phys., 84, 5703(1998)   DOI
3 C. Yan, F. Cheng, Z. Peng, Z. Xu, and C. Liao, J. Appl. Phys., 84, 5703(1998)   DOI
4 M.M. El-Ocker, M.A. Mostafa, H.M. Talaat Aly, R.L. Mohamed, and A.S.T. Saandoun, Phys. Stat. Sol., (a) 158, 205(1996)   DOI   ScienceOn
5 J.G Lee, J.Y. Park, and C.S. Kim. J. Mater Sci., 53, 3965(1998)
6 F. Cheng, Z. Peng, Z. Xu, C. Liao, and C. Yan, Thin Solid Films, 339, 109(1999)   DOI   ScienceOn
7 채광표, 이재광, 권혁수, 이영배, 한국자기학회지, 13, 231(2003)
8 G.A. Sawatzky, F. Van der Woude, and A.H. Morrish, Phys. Rev., 187, 747(1971)   DOI
9 B.D. Cullity, Elements of X-Ray Diffraction, Addition Wesley Co. (1978)
10 B.D. Cullity, Introduction to magnetic materials, Addition Wesley Co. (1972)
11 L. Rout, P. Tailhades, and A. Rousset, J. Magn. Magn. Mater, 153, 389(1996)   DOI   ScienceOn
12 G.A. Sawatzky, F. Vander Woude, and A.H. Morrish, Phys. Rev., 187, 747(1969)   DOI