TITLE:
Magnetic, Electrical and Magnetotransport Properties of Mg(Fe0.8Ga0.2)2O4 δ Obtained by Pyrohtdrolitic Method
AUTHORS:
A. V. Trukhanov, S. V. Trukhanov, O. P. Smirnov, A. A. Kulikov, H. Szymczak
KEYWORDS:
Ferrimagnetic Spinel Oxide, Magnetic Structure, Vibration Magnetometry, Neutron Powder Diffraction, Magnetotransport
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.2,
February
9,
2015
ABSTRACT:
The magnetic, electrical and magnetotransport properties of spinel-type
Mg(Fe0.8Ga0.2)2O4 δ ceramic ferrites have been investigated. The results of the
investigations temperature and field dependences of magnetization and
resistivity are presented and analyzed. The data of neutron scattering were
found to be in good agreement with the Neel model of ferrimagnetism. This
compound is magnetomonophase ferrimagnetic in the wide range of temperatures,
and shows transition in paramagnet at high temperature (~490 K). Mg(Fe0.8Ga0.2)2O4 δ is characterized by maximal
value of magnetization (28 emu/g) in the range of Mg(Fe1－xGax)2O4 δ solid solutions. A negative magnetoresistance
(MR) effect has been observed in Mg(Fe0.8Ga0.2)2O4 δ ferrite spinel. It has been determined
that coefficient of the negative MR increased from 0.23% (at room temperature)
to 7.28% (at 220 K). It can be explained with the help of the spin-dependent
scattering on magnetic inhomogeneity of granular boundary.