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Spin-wave dispersion in Permalloys of composition Fe0.2Ni0.8 and Fe0.5Ni0.5 was investigated by neutron-scattering methods. Values of D in the expression for the spin-wave energy, ħω = Dq2(1−βq2), were found to agree with spin-wave resonance measurements, but the quartic coefficients β were an order of magnitude smaller.
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Menzinger et al. (1968) studied this question.
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