Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/28097

A Phenomenological Model of Percolating Magnetic Nanostructures

Authors Wong, S.K. HKUST affiliated (currently or previously).
Zhao, Binran HKUST affiliated (currently or previously).
Ng, Tai Kai View this author's profile
Jing, Xiunian HKUST affiliated (currently or previously).
Yan, Xiao HKUST affiliated (currently or previously).
Hui, Pakming
Issue Date 1999
Source European Physical Journal B , v. 10, (3), August 1999, p. 481-485
Summary Transport and magnetotransport properties were analysed systematically in percolating magnetic nanostructures such as Ni-rich NiFe-SiO2 and Fe-SiO2 films. These granular magnetic films exhibit giant Hall effect. We identified features which are common and unique to these systems. Among the features are the correlation between a - log(T)-like temperature dependent resistivity and a particle size distribution having a large fraction of small nanometer sized particles, and the power law dependence between the magnetoresistivity and the room temperature resistivity. Assuming the presence of nanometer sized particles in the percolating conduction channels whose contributions are sensitive to temperature and the external magnetic field, we developed a phenomenological model to explain all the common features.
Subjects
ISSN 1434-6028
Language English
Format Article
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