Nondegenerate Parametric Pumping of Spin Waves by Acoustic Waves
Nondegenerate Parametric Pumping of Spin Waves by Acoustic Waves
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声波对自旋波的非简并参数泵浦
DOI：
10.1109/lmag.2017.2737962
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发表时间：
2017
影响因子：
1.2
通讯作者：
P. Dhagat
中科院分区：
文献类型：
--
作者：
P. Chowdhury;A. Jander;P. Dhagat
磁致伸缩材料中自旋波（磁振子）和声波（声子）之间的线性和非线性相互作用为实现新型微波信号处理器件和自旋电子电路提供了令人兴奋的机会。在这里，我们展示了声波在铁磁体中参数泵送自旋波，这种可能性在理论上早就预料到了，但从未在实验中实现。自旋波在钇铁石榴石薄膜（具有低自旋和声波阻尼的磁致伸缩铁磁体）中传播，使用频率接近自旋波频率两倍的声学谐振器进行泵浦。观察到一个反向传播的空闲波和一个明显的泵浦阈值，该阈值随频率非简并而二次增加，证明了一个与经典理论一致的非线性参数泵浦过程。这个声学参数泵浦的演示为开发新的自旋电子和微波信号处理设备奠定了基础，这些设备基于有效的、空间局部化的声学换能器对自旋波的放大和操纵。
The linear and nonlinear interactions between spin waves (magnons) and acoustic waves (phonons) in magnetostrictive materials provide an exciting opportunity for realizing novel microwave signal processing devices and spintronic circuits. Here, we demonstrate the parametric pumping of spin waves by acoustic waves in a ferrimagnet, the possibility of which has long been theoretically anticipated but never experimentally realized. Spin waves propagating in a thin film of yttrium iron garnet—a magnetostrictive ferrimagnet with low spin and acoustic wave damping—are pumped using an acoustic resonator driven at frequencies near twice the spin wave frequency. The observation of a counterpropagating idler wave and a distinct pump threshold that increases quadratically with frequency nondegeneracy are evidence of a nonlinear parametric pumping process consistent with classical theory. This demonstration of acoustic parametric pumping lays the groundwork for developing new spintronic and microwave signal processing devices based on amplification and manipulation of spin waves by efficient, spatially localized acoustic transducers.
自旋波的声学参数泵浦
影响因子：
2.1
作者：
H. Keshtgar;M. Zareyan;G.E.W. Bauer
通讯作者：
G.E.W. Bauer