Conventional magnon BEC in YIG film

Abstract

The conventional magnon Bose-Einstein condensation (BEC of magnons with k = 0) is a coherent state of excited magnons described by a common wave function. It was observed first in antiferromagnetic superfluid states of 3He. Here we report on the discovery of a very similar magnon BEC in ferrimagnetic film at room temperature. The experiments were performed in Yttrium Iron Garnet (YIG) films at a magnetic field oriented perpendicular to the film. The high-density quasiequilibrium state of excited magnon was formed by methods of pulse and/or Continuous Waves (CW) magnetic resonance. We have observed a Long Lived Induction Decay Signals (LLIDS), well known as a signature of spin superfluidity. We demonstrate that the BEC state may maintain permanently by continuous replenishment of magnons with a small radiofrequency (RF) field. Our finding opens the way for development of potential supermagnonic applications at an ambient conditions.

arXiv comment10 pages, 10 figures. arXiv admin note: text overlap with arXiv:1705.06594 by other authors

References in corpus (11)

• Bose-Einstein condensation of photons in an optical microcavity
• Supercurrent in a room temperature Bose-Einstein magnon condensate
• Stability of Bose Einstein condensates of hot magnons in YIG
• Bose-Einstein condensation of magnons in superfluid 3He
• Magnon Condensation and Spin Superfluidity
• Self-localization of magnon Bose-Einstein condensates in the ground state and on excited levels: from harmonic to box-like trapping potential
• On the Bose-Einstein Condensation of Rotons
• Spin superfluidity and magnon BEC
• Solution of the problem of catastrophic relaxation of homogeneous spin precession in superfluid ${}^3$He-B
• Phonons in magnon superfluid and symmetry breaking field
• Condensation of phonons in an ultracold Bose gas