Hi there,(adsbygoogle = window.adsbygoogle || []).push({});

I've been trying to explain why at zero wave vector Q , in some ferromagnetic materials the spin wave has a finite energy. I know that usually the energy tends to zero as the wave vector tends to zero however in some cases there is energy at zero, wave vector, I just need to know why.

I would appreciate someone to enlighten me

newo

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Spin wave dispertion finite energy.

**Physics Forums | Science Articles, Homework Help, Discussion**