Low-damping flexible Y3Fe5O12 thin films for tunable RF/microwave processors

Yanan Zhao; Yaojin Li; Ziyao Zhou; Renci Peng; Shukai Zhu; Mouteng Yao; Bin Peng; Yifan Zhao; Yuxin Cheng; Bian Tian; Zhongqiang Hu; Zuo-Guang Ye; Zhuangde Jiang; Ming Liu

doi:10.1039/C9MH01782H

Low-damping flexible Y₃Fe₅O₁₂ thin films for tunable RF/microwave processors†

Yanan Zhao,‡^a Yaojin Li,‡^a Ziyao Zhou,*^a Renci Peng,^a Shukai Zhu,^a Mouteng Yao,^a Bin Peng,^a Yifan Zhao,^a Yuxin Cheng,^a Bian Tian,^bc Zhongqiang Hu,^a Zuo-Guang Ye,

^ad Zhuangde Jiang^bc and Ming Liu

*^ab

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* Corresponding authors

^a Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi’an 710049, China
E-mail: mingliu@xjtu.edu.cn, ziyaozhou@xjtu.edu.cn

^b International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi’an 710049, China

^c State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China

^d Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

Abstract

The tunable range of RF/microwave devices is limited not only due to the difficulty in growing high-quality magnetic oxide thin films but also because of their low magnetostrictive coefficient as in Y₃Fe₅O₁₂ (YIG) thin films. In this work, we have fabricated flexible YIG thin films by using pulsed laser deposition (PLD) technology, which exhibit a low-damping constant (2.67 × 10⁻⁴) and well-established magnetic properties suitable for RF/microwave materials. A noticeable ferromagnetic resonance (FMR) field shift of 180 Oe was obtained along the out-of-plane direction via a flexible tunable factor f(R), which results in a frequency shift as high as 550 MHz. The result shows a greater FMR tuning than that induced by ferroelectric single crystals. At the same time, a systematic theoretical framework for tuning FMR characteristics was presented for the flexible YIG/mica thin films, which would provide an effective tuning method for other flexible magnetic oxides with low magnetostrictive coefficients. Last but not least, a flexible coplanar waveguide (CPW) integrated with the flexible YIG thin films shows excellent microwave magnetic stability and fatigue-resistant behavior. It would open a new door for further applications, such as flexible spiral detectors and high-frequency signal processors in the near future.

Materials Horizons

Low-damping flexible Y₃Fe₅O₁₂ thin films for tunable RF/microwave processors†

Abstract

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Low-damping flexible Y₃Fe₅O₁₂ thin films for tunable RF/microwave processors

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