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The letter describes the drastic modifications that occur in the spin-acoustic Love-type surface wave when the ferrite substrate is mass-loaded with a nonmagnetic elastic layer.

The surface-wave coupling which obtains between an elastic bulk shear wave and two magnetostatic modes (one of which is a bulk wave and the other a surface wave) is discussed in the context of a metallised semi-infinite ferrite geometry.

Nonreciprocity characteristics observed at room temperature and v.h.f. and higher frequencies in an InSb helicon crossed-coil device are described.

A magnetoelastic surface wave is shown to exist in an elastically isotropic ferrite, e.g. y.i.g. The wave exhibits a nonreciprocal behaviour, and is found to have no counterpart in a purely elastic medium.

A thin ferromagnet slab magnetised in an arbitrary direction parallel to its plane is shown to support a magnetostatic dipolar mode hosc resonant frequency is the same as that of magnetostatic propagation in an infinite medium transverse to the bias field.

The propagation characteristics of a magnetoelastic surface wave in ferrites are described using numerical calculations pertinent to gallium-y.i.g.