Cubic nonlinear tensor of a ferromagnet |
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Authors: | G M Genkin A A Pasmanik |
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Institution: | (1) Radiophysics Institute, Gor'kii State University, USSR |
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Abstract: | The nonlinear properties of a ferromagnet are studied. Many-time retarded Green's functions are used to obtain an expression for the cubic nonlinearity tensor with allowance for spatial dispersion of a uniaxial ferromagnet. The components due to the dipole-dipole interaction of the spins and also due to the anisotropy energy are found. A comparative analysis is made of the different components of the cubic nonlinearity tensor in both the nonresonance case and for various resonances, in particular when 0, 3 2w0, 2 0, 3 0 for the case in tripling of the frequency. Here, is the frequency of the incident wave and 0 is the frequency of uniform precession. It is shown that in the non-resonance case the largest components are those that are nonvanishing when no allowance is made for spatial dispersion; in the resonance cases the largest components are those due to the dipole-dipole interaction of the ferromagnetism spins.Translated from Izvestiya VUZ. Fizika, No. 12, pp. 53–58, December, 1973. |
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