Abstract
The magnetic and electrical properties of the cobalt ferrite/metal composite thin films, prepared by reactive sputtering, were studied as a function of substrate temperature. With increasing substrate temperature, the saturation magnetization of the thin films increased owing to precipitation of the Co0.67Fe0.33 phase. Also, the electrical resistivity of the thin films decreased. From Hall experiments, the decrease of electrical resistivity of the composite thin films was mainly attributed to the increase of electron concentration. The Seebeck coefficient measurement shows that the electrical conduction mechanism of the thin films containing 37.8 and 33.7 at % Co changes from p-type to n-type and that of the thin films containing 28.5 at % Co remains n-type with increasing substrate temperature. This might be attributed to the change in composition of the cobalt ferrite matrix to Fe-excess with precipitation of Co-rich Fe alloy. ©1999 Kluwer Academic Publishers
Similar content being viewed by others
References
A. N. Okuno, S. Hashimoto and K. Inomata, J. Appl. Phys. 71 (1992) 5926.
J. W. D. Martens, ibid. 59 (1986) 3820.
J. C. Slonczewski, Phys. Rev. 110 (1958) 1341.
N. Hiratsuka, T. Kaodoshima, M. Fujita and M. Sugimoto, J. Powder Powder Met. Jpn 39 (1992) 989.
J. G. Na and C. S. Kim, IEEE Trans. Magn. MAG-32 (1996) 3611.
M. Naoe, S. Yamanaka and Y. Hoshi, ibid. MAG-16 (1980) 646.
J. M. Lavine, Phys. Rev. 114 (1959) 482.
J. G. Na, J. Mater. Sci. Lett. 16 (1997) 195.
J. G. Na, C. H. Park, K. Park and S. R. Lee, Mater. Res. Bull. 32 (1997) 1395.
T. Fujii, M. Takano, R. Katano, Y. Bando and Y. I Sozumi, J. Appl. Phys. 66 (1989) 3168.
I. G. Austin and N. F. Mott, Adv. Phys. 18 (1969) 41.
T. O. Mason and H. K. Bowen, J. Am. Ceram. Soc. 67 (1984) 69.
G. H. Jonker, J. Phys. Chem. Solids 9 (1959) 165.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Na, J.G., Park, C.H., Heo, N.H. et al. Effects of substrate temperature on the magnetic and electrical properties of cobalt ferrite/metal composite thin films. Journal of Materials Science: Materials in Electronics 10, 59–62 (1999). https://doi.org/10.1023/A:1008931224453
Issue Date:
DOI: https://doi.org/10.1023/A:1008931224453