Re-distribution (condensation) of magnons in a ferromagnet under pumping
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received April 20, 2007
Last years several experiments were performed, which studied the Bose-Einstein condensation of quasi-particles, in particular, magnons in magnetically ordered systems. Recently the Bose-Einstein condensation of magnons was observed at room temperatures in a ferromagnetic film. The theory of the condensation (re-distribution) of magnons under the conditions of pumping, which explains many features of that experiment, is presented. The use of the term «Bose-Einstein condensation of magnons» is discussed.
PACS: 03.75.Nt Other Bose-Einstein condensation phenomena; PACS: 75.45.+j Macroscopic quantum phenomena in magnetic systems; PACS: 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance.
Key words: condensation of magnons, parametric pumping.