Indirect Nuclear Spin Interaction in Ferromagnets. Highest Approximation

Abstract

The problem of obtaining the nuclear spin interaction Hamilton operator via magnon field in ferromagnets is discussed by consecutive canonic transformation method. Using this method the one magnon nuclear spin interaction in any order of perturbation theory is taken into account. The indirect spin interact,ion Hamilton operator constant obtained is compared with the well known Suhl-Nakamura interaction constant. It is shown, that in the second order of perturbation theory these results coincide. MeTOnOM nOCJlenOBaTeJIbHblX IntroduetionThe consecutive canonic transformation method has been suggested in [l to 31 in order t o obtain the indirect spin interaction via the phonon field.The spin system Hamiltonian interacting with the phonon field has the form(1)where Hal, Ho, are the Haniiltonians of the spin and phonon subsystems, respectively, V is their interaction operator. The traditional method of obtaining the indirect spin interaction operator consists of two stages : I n the first stage, the canonic transformation