YIG膜中的常规磁振子BEC
Conventional magnon BEC in YIG film
摘要：
传统的磁振子玻色-爱因斯坦凝聚（k = 0的磁振子的BEC）是由一个共同的波函数描述的激发磁振子的相干态。它首先在反铁磁超流态的3He中被观察到。在这里，我们报告发现一个非常相似的磁振子BEC在亚铁磁膜在室温下。实验在垂直于薄膜取向的磁场下在钇铁石榴石（YIG）薄膜中进行。利用脉冲和连续波磁共振方法，可以形成高密度准平衡态的激发磁振子。我们已经观察到了一个长寿命的感应衰变信号（LLIDS），众所周知的自旋超流的签名。我们证明，BEC状态可以保持永久通过不断补充的磁振子与一个小的射频（RF）场。我们的发现为在环境条件下开发潜在的超磁子应用开辟了道路。
英文摘要：
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.
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