has given a talk at our group meeting today. It was about interaction of magnons and phonons in the context of spin transfer. The results oultined are as follows:
1. Linear Magneto-Elastic Coupling (MEC) leads to an avoided level
crossing in the (quasi) magnon and (quasi) phonon branches of the
dispersion relation at which a new quasi particle - magneto polaron is
formed.
2. We observe that linear MEC forms the basis of already known effects
such as acoustic ferromagnetic resonance and predicts some novel effects
such as acoustically assisted magnetic switching.
3. Non-linear MEC is responsible for energy exchange and equilibration
between phonons and magnons thereby forming the basis of effects such as
the spin Seebeck effect.
No comments:
Post a Comment