Magnons Dispersion Relation

1. Jul 13, 2012

PLuz

Hello,

Can anyone explain to me why, concept wise (not from calculations that I get it), is the dispersion relation of magnons (spin waves) quadratic in $k$ for small wavelengths?

Also, can you give me other examples where such behavior appears?

Thank you

Last edited: Jul 13, 2012
2. Jul 16, 2012