The dispersion relation of the magnetostatic volume wave in a normally magnetized ferromagnetic slab placed between two metal plates is analyzed. When the normalized spaces A=D1/S and B=D2/S, where D1 and D2 are the spaces between the slab and the metals and S is the slab thickness, are finite, the cutoff frequency Ωc exists in the dominant mode and becomes {ΩH[ΩH+1/(A+B+1)]}1/2, where ΩH =Hi/4πMs, Hi is the internal magnetic field, and 4πMs is the saturation magnetization. This frequency Ωc gives the lower limit of the frequency region in which the magnetostatic volume wave exists and varies with A+B from ΩH to [ΩH(ΩH+1)]1/2. The experimental values on the change of Ωc with A+B have agreed well with the theoretical results.
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