Eff ective renormalization of g-factors anisotropic ferromagnetic narrow-band f-d-metal

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Вісник ХНУ, серія «Фізика», вип. 26, 2017. с. © Model and method The charts of electronic power spectrum (Fig. 1) and spectrum of elementary excitations (Fig. 2) of the investigated system used in-process are analogical to used in [6]. Electronic descriptions of the investigational system were analogical to considered in [6], except for the parameters of "interatomic" exchange between local and quasilocal electrons, which in this case was anisotropic,-  2 X X Y Y Z Z ex H J S s S s JS s   
more » ...      . Here S and s are backs local f-shells and quasilocal d-электрона, accordingly, S>>1; J ⊥ and J is interatomic exchange constants, 0< J ⊥ ≤J. Model Hamiltonian Hamiltonian of the system in the external magnetic fi eld of H, directed along the coordinate axis of Z, looks like m e Conducting anisotropic narrow-band ferromagnetic connections on the basis of f-d-elements attract enhanceable interest, as systems tightly-coupled between electronic, magnon and latticed by subsystems [1-3]. Magnetic resonance is the eff ective instrument of research of their power spectrum, however the mechanisms of forming of g-factors of magnetic moments in such substances are studied not enough. Methods of theoretical researches of the resonant phenomena, developed for ferromagnetics described within the framework of charts with Heisenberg intersite by an exchange, as in dielectric [4], so in wide-band conducting systems [5], inapplicable for direct description of the connections examined here. In the real work we investigated the spectrums of magnetic excitations in a narrow-band ferromagnetic explorer containing local (f) and quasilocal (d) magnetic moments [6]. These spectrums are formed by the spin correlations generated jointly by interatomic co-operations of d electrons (by an exchange with the electrons of shells and Hubbard pushing away), and them intersite hops, taking into account the spatial chaotization of g-factors d-and f-subsystems [6].