Abstract
Thermal magnons within the optical skin layer of ferromagnetic MnP single crystal ( T c ∼290 K) have been studied by Brillouin light scattering in a temperature range between 80 K and 310 K under zero magnetic field. For temperatures below ∼ T c /2, the magnon energy gaps obtained from Brillouin scattering show good agreement with the bulk magnon gaps obtained from neutron scattering and torque method. Well below the Curie temperature, Brillouin scattering has been established as a convenient technique to determine the energy gaps in itinerant ferromagnets. The spins near the surface seem to undergo a surface magnetic phase transition at much lower temperatures than the bulk T c . A complete set of the elastic constants at room temperature has been determined.
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