Abstract
The Green's function technique (including dipole-dipole interactions) is applied to a bulk ferromagnet to obtain an expression for the magnetization at low temperatures. Only the lowest order Green's functions are used in the calculations, allowing only for single excitations. The result obtained is identical with the Holstein and Primakoff result and the Haas result, both of which were intended to be more inclusive than the present calculation—Holstein and Primakoff via diagonalizing the Hamiltonian, and Haas via symmetrically decoupling generated higher order Green's functions.
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