抄録
Magnetoelastic waves (MEWs) propagating in a thin conductive magnetostrictive slab were investigated theoretically taking account of the micro-eddy current contribution. The analysis was performed under the assumption that the medium is amorphous (isotropic elasticity) but has a uniaxial magnetic anisotropy in the slab plane. MEWs in this configuration are three fundamental modes: Lamb-type wave of the extensional mode (EMEW), SH-type wave (SMEW) and Lamb-type wave of the flexural mode (FMEW). The microeddy current crucially affected the propagation properties, thereby increasing the propagation loss as well as decreasing the controllable MEW velocity with external magnetic field. The amounts of these quantities also varied depending strongly on the anisotropy orientation β for the above three wave modes, because the degree of coupling between the magnetization and the lattice through magnetoelastic interaction is different in each mode. The present analysis revealed that SMEW with β=45° is the most favorable for delay line application.
