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S e p t e m b e r 2 4 - 2 6 , 2 0 1 8 | B u d a p e s t , H u n g a r y
OF EXCELLENCE
IN INTERNATIONAL
MEETINGS
YEARS
Magnetic Materials 2018 Materials Science and Nanotechnology | Volume 2
MAGNETISM AND
MAGNETIC MATERIALS
2nd International Conference on
Mater Sci Nanotechnol 2018, Volume 2
THERMODYNAMICS OF METAMAGNETOELECTRIC EFFECT IN
MULTIFERROICS
F Kuate Fodouop1, G C Fouokeng1,2, M Tchoffo1 and L C Fai1
1University of Dschang, Cameroon
2Institut Universitaire de la Côte, Cameroon
Magnetoelectric coupling factor in multiferroics give rise to various properties such as metamagnetoelectric effect since
an external field act. In this study, a general thermodynamic framework is developed to investigate metamagnetoelectric
effects in multiferroic materials. The model used is a quasi-two-dimensional frustrated spin chain controlled by a static electric
field in y direction and magnetic field in z-direction. The effects of metamagnetoelectric transitions on entropy, specific heat and
on the linear magnetoelectric coupling factor are assessed using Fermi Dirac statistics of quantum gases and the Landau theory.
The entropy behavior is shown like that of the magnetic susceptibility. In fact, while the magnetic susceptibility characterizes
the variations of magnetization and accordingly emphasizes the ferroic transition points of this order, the intrinsic physics of
these transition points highlights a muddle occurring due to a rearrangement of magnetic moments in the system, and this is
accurately described in terms of entropy. The transition effects due to this rearrangement described in terms of entropy at the
corresponding critical points show different loop to that of the specific heat. The opposite loop showed by the specific heat
compared to the entropy is its weakening at the exact transition point despite its strengthening during the transition process.
The temperature dependence of the magnetoelectric coupling highlights how it is continuously weakened beyond the transition
point. This shows for any point defined by a pair of values of electric and magnetic fields, the range of temperature which allows
metamagnetoelectric effect and how it vanishes continuously when the temperature increases.