OBSERVATION OF MAGNONS BY LIGHT-SCATTERING IN EPITAXIAL COFE MN/COFE TRILAYERS/

We report on Brillouin scattering measurements on a CoFe/Mn/CoFe trila yer film characterized by unusually large biquadratic coupling. The ma gnetic field dependence of the exchange coupled in- and out-of-phase m agnons as well as their in-plane directional dependence are determined . The saturation magnetization of the trilayer was measured independen tly through superconducting quantum interference device magnetometry. The spin wave data is well represented by a generalization of the mode l that takes into account the antiferromagnetic order in the Mn layer. (C) 1997 American Institute of Physics.