Abstract
In this paper, we presented a theoretical method for studying the behavior of magnetic field intensity and eddy current inside a magnetostriction based bi-layered composite. Firstly, the mathematical model for the electromagnetic field in the composite was established. Then, the governing equation for determining the magnetic field intensity and eddy current was solved. Furthermore, the effect of the composite’s conductivity on the magnetic field intensity and eddy current were discussed. Lastly, by comparing with the well known R.L. Stoll’s equation, the magnetic field intensity calculated based on our equation showed a less than 0.5% error.
Highlights
Magnetostrictive materials are a type of functional materials which can change its shape in response to external magnetic field known as “Joule effect”
In many applications magnetostrictive materials are coupled with other materials forming bi-layered composite such as Metglas/Copper,[11] CoFe2O4/PMN-PT,[12] La0.7Sr0.3MnO3/BaTiO3,13 Ni/Pb(Zr0.52Ti0.48)O314 composite to achieve some unique functions as aforementioned
From Maxwell equations, it is known that eddy current is strongly dependent on many electromagnetic parameters such as magnetic field intensity, magnetic angular frequency, conductivity, dielectric permittivity, magnetic permeability as well as the structure of a material
Summary
Magnetostrictive materials are a type of functional materials which can change its shape in response to external magnetic field known as “Joule effect”. This unique property makes magnetostrictive materials widely used in a variety of functional devices such as sensors,[1,2,3] actuators,[4,5] transducers,[6,7] and energy harvesting devices.[8] under the condition of external alternative magnetic field, especially at high working frequency, eddy current is inevitably induced which leads to the decrease in output power, superheating, and thermo instability of devices. We investigated the behavior of magnetic field intensity and eddy current in a laminated magnetostrictive composite aiming at optimizing the distribution of eddy current in such structured devices for their applications
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