Abstract
The influence of the exchange interaction on the properties of spin-electron acoustic waves at the oblique propagation of waves relative to the external magnetic field in the magnetically ordered metals is studied. The spectra of the Langmuir wave and the Trivelpiece-Gould wave is also considered. It is well-known that there are two branches of the spectrum of the spin-electron acoustic waves in this regime. The change of their properties under the influence of the exchange interaction is studied. The quantum Bohm potential is included either. The exchange interaction and the quantum Bohm potential give opposite contributions, but they do not compensate each other since they have different dependences on the wave vector. This competition creates a non-monotonical behavior of the Trivelpiece-Gould wave spectrum. The concavity changes in the monotonic spectra of the Langmuir wave and the SEAWs are found.
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