As known, the spin wave damping usually increases with the increase of the temperature due to the thermal effect. I observed a rapid increase in the spin wave damping when the low-T non collinear ferrimagnetic ordering changes to Neel ferrimagnetic ordering at higher temperature. The magnetic interactions are simpler in the higher-T Neel Ferrimagnetic ordering, why is there a rapid increase in the spin wave damping? Could anybody give me some advice to understand this observation?
Damping of spin waves are caused due to the interaction of spin waves with each other (magnon-magnon interaction) and also with lattice vibrations (phonon-magnon interaction) and conduction electrons (electron-magnon interaction). Damping due to all these interactions have been treated in the book
Spin waves, Akhiezer, Bar'yakhtar and Peletminskii, North Holland (1968)
and also in
Interactions in magnetically ordered solids, K.P. Sinha and N. Kumar, Oxford (1980).
One does not expect and drastic change in damping rate just due to the magnetic structure or even interactions. As you correctly pointed out that temperature increases damping due to increased magnon-magnon interactions. You must check whether the phonon frequencies or the transport properties change in the high temperature phase. That will give you a clue whether the extra damping is due to phonon-magnon or electron-magnon processes.
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