Breitbach D, Schneider M, Heinz B, Kohl F, Maskill J, Scheuer L, Serha R O, Brächer T, Lägel B, Dubs C, Tiberkevich V S, Slavin A N, Serga A A, Hillebrands B, Chumak A V, Pirro P
Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, D-67663 Kaiserslautern, Germany.
Faculty of Physics, University of Vienna, A-1090 Vienna, Austria.
Phys Rev Lett. 2023 Oct 13;131(15):156701. doi: 10.1103/PhysRevLett.131.156701.
Spin-wave amplification techniques are key to the realization of magnon-based computing concepts. We introduce a novel mechanism to amplify spin waves in magnonic nanostructures. Using the technique of rapid cooling, we create a nonequilibrium state in excess of high-energy magnons and demonstrate the stimulated amplification of an externally seeded, propagating spin wave. Using an extended kinetic model, we qualitatively show that the amplification is mediated by an effective energy flux of high energy magnons into the low energy propagating mode, driven by a nonequilibrium magnon distribution.
自旋波放大技术是实现基于磁振子的计算概念的关键。我们引入了一种在磁振子纳米结构中放大自旋波的新机制。利用快速冷却技术，我们创造了一种高能磁振子过量的非平衡态，并证明了外部注入的传播自旋波的受激放大。使用扩展的动力学模型，我们定性地表明，放大是由高能磁振子向低能传播模式的有效能量通量介导的，该通量由非平衡磁振子分布驱动。
