2020/09/01 by P. M. Vetoshko, G. A. Knyazev, A. N. Kuzmichev +3 · 3 citations
Physics and Astronomy · #Quantum, superfluid, helium dynamics #Physics of Superconductivity and Magnetism #Mechanical and Optical Resonators
paper · doi:10.1134/s0021364020170105
The formation of a Bose—Einstein condensate of magnons in a perpendicularly magnetized iron yttrium garnet film under radio-frequency pumping in a stripline has been studied experimentally. The characteristics of the nonlinear magnetic resonance and spatial distribution of the Bose—Einstein condensate of magnons in the gradient of a magnetic field have been analyzed. In these experiments, the system of bosonic magnons behaves in much the same way as the Bose—Einstein condensate of magnons in antiferromagnetic superfluid 3 He-B, which was previously studied in detail. The Bose—Einstein condensate of magnons forms a coherently precessing state having the properties of magnon superfluidity. Its stability is determined by the repulsion potential between excited magnons, which compensates the inhomogeneity of the magnetic field.