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This contribution describes the reorientation of the magnetization of thinferromagnetic Heisenberg films as function of the temperature and/or anexternal field. Working in a rotating frame allows an exact treatment of thesingle-ion anisotropy when going to higher-order Green's functions. Terms dueto the exchange interaction are treated by a generalized Tyablikov (RPA)decoupling.Comment: 9 pages, 2 figure

The magnetic reorientation transition in thin ferromagnetic films treated by many-body Green's function theory