Influence of Particle Size on the Electrical Properties
and Magnetic Field Dependent I–V Characteristics
of Nanocrystalline ZnFe2O4 |
Prabir Ghosh,1 Rabindra Nath Bhowmik,2 Swagata Bandyopadhyay1 and Partha Mitra1, *
Pages : 111-120
DOI : 10.1080/0371750X.2019.1624618 |
Abstract |
The influence of grain size (7-16 nm) on electrical conductivity, dielectric properties
and magnetic field dependent I–V characteristics along with magnetoresistance
have been studied for zinc ferrite (ZnFe2O4). ZnFe2O4 was prepared by
co-precipitation technique. Ball milling on the chemical routed material was carried
out to control the particle size. The effect of particle size on the conduction
mechanism was investigated by nonlinear least-squares fitting of the impedance
spectrum. The electrical response was found to be strongly influenced by the
particle size of the material. Electrical conductivity decreased with decrease of
particle size. Electrical conductivity (ï³) significantly changed with temperature
indicating thermal activated conductivity mechanism. I–V characteristics of the
material showed variation of resistance with magnetic field, indicating existence
of magnetoresistance (MR). The exhibition of I–V loops confirmed the existence
of two irreversible electronic states (bi-stable states: LRS and HRS) in the material,
which helped to extract information about non-volatile electronic states and
electrical power loss (loop area) in presence of magnetic field. The I–V loop
repetition for 20 times within bias voltage range ±20 V gave the information about
the stability of the current variation with bias voltage.
[Keywords: Zinc ferrite nanocrystals, I–V characteristics, Magnetoresistance,
Bi-stable electronic states] |
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