We report on Brillouin scattering measurements on a CoFe/Mn/CoFe trilayer film characterized by unusually large biquadratic coupling. The magnetic field dependence of the exchange coupled in- and out-of-phase magnons as well as their in-plane directional dependence are determined. The saturation magnetization of the trilayer was measured independently through superconducting quantum interference device magnetometry. The spin wave data is well represented by a generalization of the model that takes into account the antiferromagnetic order in the Mn layer.
X-ray-excited Co 2p photoemission lines from YCoO3, HoCoO3, GdCoO3 and Sr2(SbCo)O6 are broadened asymmetrically by multiplet splitting. The spectrum from the high-spin compound Sr2(SbCo)O6 is independent of temperature. In the other three cases the line broadening shows a marked increase with increasing temperature. This effect is attributed to a decrease, caused by thermal expansion, in the value of the octahedral ligand-field splitting parameter 10Dq, which lies not far above the value at which crossover to the high-spin state occurs. Magnetic susceptibility data for YCoO3 are shown to be consistent with this interpretation. There is no evidence in favour of an ordering transition, or of electron transfer between high-spin and low-spin Co3+ ions.
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