Discrepancy between Spin-Wave Dispersion and Temperature Dependence of Magnetization in Amorphous Ferromagnets
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概要
- 論文の詳細を見る
Effects of randomness on spin-wave excitations are investigated for a Heisen-berg ferromagnet in which magnitudes of spins deviate randomly from the meanmagnitude. The randomness reduces the spin-wave stiffness and makes theexcitation spectra broad but the excitation eutergy determined from the positionof the peak of the spectrum obeys a quadratic dispersion relation fairly well forlong wavelengths. However, temperature dependence of the magnetization doesnot agree with that expected from this dispersion relation using the elementarysj5in-wave theory. The decrease of the magnetization is more marked. This dis-agreement is due to the finite line-widths of the spin-wave excitations. Presentcalculations provide an explanation for the discrepancy between the experimentalresults obtained by magnetization measurement and neutron scattering in manyamorphous ferromagnets.
- 社団法人日本物理学会の論文
- 1982-10-15
著者
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Mano Hiroshi
Department Of Agricultural Chemistry Faculty Of Agriculture Tokyo University Of Agriculture
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Mano Hiroshi
Department Of Physics Gakushuin University
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