首页|A deep insight into the magnetic properties of cobalt ferrite by non-equilibrium thermodynamics with internal variables
A deep insight into the magnetic properties of cobalt ferrite by non-equilibrium thermodynamics with internal variables
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NSTL
Elsevier
The paper presents for the first time an in-depth theoretical magnetic characterization of cobalt ferrite nano particles (CoFe2O4) by using the thermodynamic approach of non-equilibrium with internal variables. Considering that a complete knowledge of the structure and properties is crucial to design a material for a specific application, a complete thermodynamic characterization of magnetic properties turns out to be useful for a plethora of technological and biomedical purposes. The non-equilibrium thermodynamics is exploited to calculate the internal variables as a function of the perturbation frequencies. Our results allow to fully characterizing the investigated material in terms of magnetization by orientation and by deformation (M-(1) and M-(0)), magnetic field B-(1), magnetization displacement current (E), entropy production (sigma), phenomenological coefficients (L-(0,L-0) and L-(1,L-1)) and state coefficients (a((0,0)), a((1,1))). CoFe2O4 has been selected as a proof of concept; our theoretical investigation and parameters are applicable to all the para-and ferromagnetic materials, including biomolecules and biological tissues allowing to compare healthy and pathological behavior, subjected to a variable magnetic field for which it is possible to conceive a linear approximation.
Magnetic nanoparticlesNon-equilibrium thermodynamicsSpinel ferritesMagnetic susceptibilityMagnetic relaxationIron oxideRELAXATION PHENOMENANANOPARTICLES
NSTL
Elsevier
