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Nonlinear scattering in nanoscale magnetic elements: Overpopulation of the lowest-frequency magnon state

机译:纳米级磁性元素中的非线性散射:最低频率的磁振子态的过剩

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摘要

We utilized Brillouin light-scattering spectroscopy to study the magnetization dynamics in nanoscale permalloy elements driven by a large microwave magnetic field. We demonstrate that at large precession angles, the magnons excited by the microwaves scatter into the lowest-frequency state by a process similar to the scattering that leads to the Bose-Einstein condensation of magnons in the low-loss garnet films. The discovered effect is important for understanding the nonlinear processes in strongly driven nanomagnetic devices such as spin-torque nano-oscillators and magnetic memory.
机译:我们利用布里渊光散射光谱研究了由大微波磁场驱动的纳米级坡莫合金元素的磁化动力学。我们证明,在大进动角处,由微波激发的马农会通过类似于散射的过程散射到最低频率状态,该散射会导致低损耗石榴石薄膜中马农的玻色-爱因斯坦凝聚。发现的效应对于理解强驱动纳米磁性器件(如自旋扭矩纳米振荡器和磁存储器)中的非线性过程很重要。

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