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No.4(pp.111-156)

Home > Issues > Volume 3 (1998) > No.4(pp.111-156)

Spin Dependent Transport Phenomena for Annealed Co₄₆Al₁₉O₃₅ Granular Thin Films

Journal of Magnetics, Volume 3, Number 4, 31 Dec 1998, Pages 127-133

Jae-Geun Ha(Dept. of Electronic Materials Engineering, Kwangwoon University)

Abstract

I have overviewed the change in GMR on annealing, in conjunction with the change in microstructure. The Co₄₆Al₁₉O₃₅ granular thin films were annealed at 300℃ for various annealing time to change the microstructure. The magnitude of GMR decreases considerably with increasing annealing time, although the size of Co granules estimated from TEM observation show a small change. Parameter fits of magnetization curves and magnetoresistance curves to the Langevin function suggest that large clusters consisting of several small Co granules, which are coupled ferromagnetically, are related with the decrease of GMR on annealing. The temperature dependence of electrical resistivity (ρ) shows the relationship of log ρ versus T^-1/2for the sample annealed for 10 min., 1 hr. and 6 hrs. However, the sample annealed for 38 hrs. shows the relationship of log ρ versus T^-1/4, which represents a significant change in the transport mechanism.

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