Dynamics and spontaneous coherence of magnons in ferromagnetic thin films

Roberto E. Troncoso, Álvaro S. Ñez

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A theory of the dynamics of the BoseEinstein condensate of magnons is presented. It is shown that, despite magnon decay processes, ongoing during the condensate formation, the system manifests spontaneous quantum coherence with a pseudo-spin degree of freedom originated from the presence of two valleys in momentum space. Finally, a real space description of the condensed state is provided, revealing the condensate state as a spin density wave. The effective dynamics of the spinor condensate wavefunction is characterized, and it is shown to display Josephson-like relations.

Original languageEnglish
Article number036006
JournalJournal of Physics Condensed Matter
Volume24
Issue number3
DOIs
StatePublished - 25 Jan 2012
Externally publishedYes

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