| Summary: | In this project a microscopic description of the magnon-phonon coupling is rederived. This theory is then used to simulate the thermalization process between the spin and lattice system in NiO. It is argued that the Kusuya-LeCraw process (1 mg + 1 ph into 1 mg) cannot be the reason that the phononic and magnonic systems reach a thermal equilibrium. As a consequence a quasi-stable equilibrium, different from the thermal solution, is reached in less than 1 ps for NiO. Finally, the effect of applying an external magnetic field to the system, breaking the degeneracy between the magnons of opposite polarization, is studied.
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