On separation of exchange term from the coefficient of the magnetoelectromechanical coupling

摘要

The purpose of this analysis is to introduce the separated exchange coefficient and to graphically investigate it. This coefficient, depending on the electromagnetic constant plus two coefficients of the electromechanical and magnetomechanical couplings, form the coefficient of magnetoelectromechanical coupling (CMEMC), a very important characteristic used for analysingmagnetoelectroelastic smart (composite) materials. It was analytically and graphically demonstrated that the CMEMC can have a minimum due to the minimum of the exchange coefficient at a certain value of the electromagnetic constant. For graphical investigation, the frequently used transverselyisotropic (6$mm$) composite materials such as BaTiO$_3$a€“CoFe$_2$O$_4$ and PZTa€“5Ha€“Terfenola€“D are exploited.