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

Abstract

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 analysing magnetoelectroelastic 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 transversely isotropic (6mm) composite materials such as BaTiO 3 -CoFe 2 O 4 and PZT-5H-Terfenol-D are exploited.

Dramatic Influence of the Magnetoelectric Effect on the Existence of the New SH-SAWs Propagating in Magnetoelectroelastic Composites

“…It is necessary to state that conditions (15) and (16) are also fulfilled when the 2 em K has extreme points due to the existence of extreme points of the separated exchange coefficient 2 ex K [25]. It is worth noting that the condition of V BGM = V tem can also exist when 2 0 em K = that results in the following:…”