Geodesic
Spectrum of elementary excitations in compounds formed by a~rare-earth metal and a~transition metal
Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 2, pp. 289-298

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On the basis of the generalized model of a ferromagnetic metal with single-ion anisotropy a study is made of hexagonal ferromagnets that are compounds of a rare-earth metal and a transition metal with $S=1$, where $S$ is the spin of an individual rare-earth ion, and easy axis anisotropy. It is shown that there are two types of elementary excitation in these compounds: a Fermi excitation (Stoner) and a Bose excitation (spin wave). The existence of three spin-wave branches is established. Equations are obtained for the order parameters. The calculations are made by the Green's function method for longitudinal and transverse magnetic fields. 
@article{TMF_1983_54_2_a12,
     author = {Ya. M. Neimatov},
     title = {Spectrum of elementary excitations in compounds formed by a~rare-earth metal and a~transition metal},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {289--298},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_54_2_a12/}
}
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Ya. M. Neimatov. Spectrum of elementary excitations in compounds formed by a~rare-earth metal and a~transition metal. Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 2, pp. 289-298. http://geodesic.mathdoc.fr/item/TMF_1983_54_2_a12/