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Yan, P. (author), Kamra, A. (author), Cao, Y. (author), Bauer, G.E.W. (author)The angular momentum vector of a Heisenberg ferromagnet with isotropic exchange interaction is conserved, while under uniaxial crystalline anisotropy the projection of the total spin along the easy axis is a constant of motion. Using Noether's theorem, we prove that these conservation laws persist in the presence of dipole-dipole interactions....journal article 2013