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 ³He-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.

实验研究了带状线中射频泵浦下垂直磁化的铁钇石榴石薄膜中磁振子的玻色-爱因斯坦凝聚物的形成。分析了磁场梯度中磁振子的玻色-爱因斯坦凝聚态的非线性磁共振特征和空间分布。在这些实验中，玻色子磁振子系统的行为与反铁磁超流体^3中的玻色子-爱因斯坦磁振子的行为几乎相同He-B，先前已对其进行了详细研究。玻色-爱因斯坦的马农凝结物形成具有马农超流动性的相干进动状态。它的稳定性取决于激发的磁振子之间的排斥势，从而抵消了磁场的不均匀性。