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- W1995802073 abstract "An effective-field theory called the Oguchi method is used to describe the magnetization of yttrium iron garnet. The main feature of the model is that it includes spin correlation through a two-spin cluster. The theoretical magnetization is fitted by the method of least squares to the experimental data of Anderson. Three calculations are performed: The first is the so-called Ising model, for which the exchange parameters are $frac{{J}_{mathrm{ad}}}{k}=ensuremath{-}45.20$ifmmode^circelsetextdegreefi{}K, $frac{{J}_{mathrm{dd}}}{k}=ensuremath{-}25.60$ifmmode^circelsetextdegreefi{}K, and $frac{{J}_{mathrm{aa}}}{k}=ensuremath{-}15.90$ifmmode^circelsetextdegreefi{}K, and the Landau-Lifschitz stiffness constant $A$ is $7.7ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}$ erg/cm. The second calculation treats the transverse components of the ${mathrm{S}}_{a}ifmmodecdotelsetextperiodcenteredfi{}{mathrm{S}}_{d}$ interaction by second-order perturbation theory, yielding the values $frac{{J}_{mathrm{ad}}}{k}=ensuremath{-}39.94$ifmmode^circelsetextdegreefi{}K, $frac{{J}_{mathrm{dd}}}{k}=ensuremath{-}18.80$ifmmode^circelsetextdegreefi{}K, $frac{{J}_{mathrm{aa}}}{k}=ensuremath{-}12.58$ifmmode^circelsetextdegreefi{}K, and $A=1.49ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}7}$ erg/cm. The third calculation treats the transverse components of the ${mathrm{S}}_{a}ifmmodecdotelsetextperiodcenteredfi{}{mathrm{S}}_{d}$ interaction by fourth-order perturbation theory, yielding the values $frac{{J}_{mathrm{ad}}}{k}=ensuremath{-}38.36$ifmmode^circelsetextdegreefi{}K, $frac{{J}_{mathrm{dd}}}{k}=ensuremath{-}17.04$ifmmode^circelsetextdegreefi{}K, $frac{{J}_{mathrm{aa}}}{k}=ensuremath{-}11.66$ifmmode^circelsetextdegreefi{}K, and $A=1.65ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}7}$ erg/cm." @default.
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- W1995802073 date "1968-11-10" @default.
- W1995802073 modified "2023-09-27" @default.
- W1995802073 title "Calculation of the Sublattice Magnetization of Yttrium Iron Garnet by the Oguchi Method" @default.
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- W1995802073 doi "https://doi.org/10.1103/physrev.175.654" @default.
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