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Giant Hall Effect and Spin-Dependent Transport in Granular NiFe-SiO2 Films

Published online by Cambridge University Press:  10 February 2011

X. Yan ,
A. B. Pakhomov ,
X. N. Jing  and
S. K. Wong
X. Yan
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, phxyan@usthk.ust.hk.
A. B. Pakhomov
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, phxyan@usthk.ust.hk.
X. N. Jing
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, phxyan@usthk.ust.hk.
S. K. Wong
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, phxyan@usthk.ust.hk.
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Abstract

In granular NiFe-SiO2 films which display giant Hall effect, extraordinary Hall resistivity ρxys, normal Hall resistivity ρxyo, and magnetoresistivity δρ, were all found to follow power lav dependencies on resistivity ρ. Namely, -ρxys ∼ ρ0.81, -ρxyo ∼ ρ0.64 and -δρ ∼ ρ1.15. We propose that the presence of nanometer sized particles in the percolating conduction channels gives rise to I giant enhancement for both ordinary and extraordinary Hall effect in magnetic metal-insulator nanocomposite films. This physical picture describes qualitatively well the general features of GHE, and its correlation with resistivity and magnetoresistivity.

Keywords

Hall effectgranular filmstransport
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 475: Symposium M – Magnetic Ultrathin Films, Multilayers, and Surfaces – 1997 , 1997 , 81
Copyright
Copyright © Materials Research Society 1997

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References

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