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arXiv 2011.07648physics.app-ph
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一种低相位噪声可调谐磁声振荡器

A tunable magneto-acoustic oscillator with low phase noise

A. Litvinenko, R. Khymyn, V. Tyberkevych, V. Tikhonov, A. Slavin, S. Nikitov

发表信息：
Phys. Rev. Applied 15, 034057 (2021)
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摘要：

研制了一种频率可调谐的低相位噪声磁声谐振器，该谐振器采用在镓钆石榴石（GGG）衬底上生长钇铁石榴石（YIG）的平行板直边双层膜结构。当YIG/GGG样品形成理想的平行板时，它支持沿着板厚度的一系列高品质因数声学模式。由于YIG层的磁致伸缩，当模式的频率匹配时，YIG层的铁磁共振（FMR）模式可以与YIG/GGG结构的声学厚度模式强烈地相互作用。YIG/GGG双层膜中用于混合磁声振荡共振激发的特定声学厚度模式由YIG层FMR频率选择，该频率可以通过外部偏置磁场的变化来调谐。研制了一种复合磁声振荡器，它包括一个基于FMR的谐振预选器，以保证满足巴克豪森标准的单声模式振荡制度。所研制的低相位噪声复合磁声振荡器可在0.84 ~ 1 GHz范围内以约4.8 MHz（YIG/GGG平行板中相邻声学厚度模之间的频率距离）的增量调谐，在10 kHz偏频处的相位噪声为-116 dBc/Hz。

英文摘要：

A frequency-tunable low phase noise magneto-acoustic resonator is developed on the base of a parallel-plate straight-edge bilayer consisting of a yttrium-iron garnet (YIG) layer grown on a substrate of a gallium-gadolinium garnet(GGG). When a YIG/GGG sample forms an ideal parallel plate, it supports a series of high-quality-factor acoustic modes standing along the plate thickness. Due to the magnetostriction of the YIG layer the ferromagnetic resonance (FMR) mode of the YIG layer can strongly interact with the acoustic thickness modes of the YIG/GGG structure, when the modes' frequencies match. A particular acoustic thickness mode used for the resonance excitations of the hybrid magneto-acoustic oscillations in a YIG/GGG bilayer is chosen by the YIG layer FMR frequency, which can be tuned by the variation of the external bias magnetic field. A composite magneto-acoustic oscillator, which includes an FMR-based resonance pre-selector, is developed to guarantee satisfaction of the Barkhausen criteria for a single-acoustic-mode oscillation regime. The developed low phase noise composite magneto-acoustic oscillator can be tuned from 0.84 GHz to 1 GHz with an increment of about 4.8 MHz (frequency distance between the adjacent acoustic thickness modes in a YIG/GGG parallel plate), and demonstrates the phase noise of -116 dBc/Hz at the offset frequency of 10 kHz.

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