Because of the strong temperature dependence of the anisotropy constants K1 and K2 in ferromagnetic single crystals of cubic symmetry the resonance field for excitation of hypersound by ferromagnetic resonance (FMR) can be lowered to values that even at zero magnetic field hypersound can be excited. FMR experiments at 8.9 GHz are reported with oriented nickel films on polished MgO crystals. The results show that it is possible to excite hypersound in cubic crystals at zero magnetic field, and no uniaxial thermal stress is needed. By this the choice of substrates is no longer restricted to crystals with anisotropic thermal expansion, i.e. to crystals with noncubic symmetry.
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Bials et al. (1977) studied this question.
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