Unidirectional microwave transduction with chirality selected short-wavelength magnon excitations
Unidirectional microwave transduction with chirality selected short-wavelength magnon excitations
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DOI：
10.1063/5.0156369
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发表时间：
2023-03
影响因子：
4
通讯作者：
Yi Li;Tzu-Hsiang Lo;Ji-Hun Lim;J. Pearson;R. Divan;Wei Zhang;U. Welp;W. Kwok;A. Hoffmann;V. Novosad
中科院分区：
文献类型：
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作者：
Yi Li;Tzu-Hsiang Lo;Ji-Hun Lim;J. Pearson;R. Divan;Wei Zhang;U. Welp;W. Kwok;A. Hoffmann;V. Novosad
非互易磁振子传播是研制先进信息处理芯片微波隔离器的一种非常有潜力的方法。然而，它是具有挑战性的，以实现大的非互易性的微型磁性薄膜器件，因为难以区分传播表面自旋波沿着相反的方向时，膜厚度很小时。在这项工作中，我们实验上实现了单向微波转换与亚微米波长的传播磁振子在钇铁石榴石（YIG）薄膜延迟线。我们实现了30 dB的非衰减隔离，具有高达14 GHz的宽场可调谐带通频率范围。大的隔离度是由于选择的手征静磁表面自旋波与奥斯特场产生的共面波导天线。增加天线宽度和YIG厚度之间的几何比大大降低了非互易性，并引入了额外的磁振子传输带。我们的研究结果为短波长磁振子激励下的片上微波隔离和可调谐延迟线的研制奠定了基础。
Nonreciprocal magnon propagation has recently become a highly potential approach of developing chip-embedded microwave isolators for advanced information processing. However, it is challenging to achieve large nonreciprocity in miniaturized magnetic thin-film devices because of the difficulty of distinguishing propagating surface spin waves along the opposite directions when the film thickness is small. In this work, we experimentally realize unidirectional microwave transduction with sub-micrometer-wavelength propagating magnons in a yttrium iron garnet (YIG) thin-film delay line. We achieve a non-decaying isolation of 30 dB with a broad field-tunable bandpass frequency range up to 14 GHz. The large isolation is due to the selection of chiral magnetostatic surface spin waves with the Oersted field generated from the coplanar waveguide antenna. Increasing the geometry ratio between the antenna width and YIG thickness drastically reduces the nonreciprocity and introduces additional magnon transmission bands. Our results pave the way for on-chip microwave isolation and tunable delay line with short-wavelength magnonic excitations.