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説明:

In nuclear magnetic resonance (NMR) spectroscopy, the signal from nuclear spins is extremely weak, and thus, it has been desired to improve the signal-to-noise ratio (SNR). In this study, we designed a compact low-noise probe and peripheral detection system optimized for low-temperature solid-state NMR spectroscopy. We confirmed the operation of a Tx/Rx switch composed of radio frequency microelectromechanical system (RF MEMS) switches and a preamplifier using high electron mobility transistors (HEMTs), which can operate even at 20 K and under a high magnetic field of ∼10 T. In our compactly designed NMR system, we succeeded in sufficiently reducing both thermal noise and external noise. As a result, the 195Pt- and 27Al-NMR measurements for Pt and Al solid powder samples were performed at 12 T and down to 20 K, showing that the SNR was improved by 40%–50% compared with the conventional system. These experiments also provide information on the low temperature properties and operational characteristics of integrated RF electronic devices, such as the RF MEMS switch, the HEMT, and their combined circuit system.

権利情報:

• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Sotaro Nishioka, Naoki Sakuyama, Ken Obara, Akiko T. Saito, Mitsuharu Yashima, Hidekazu Mukuda; Low-noise and compact detection system using RF MEMS switch for solid-state NMR spectroscopy at cryogenic temperature: Proof-of-concept experiment. Rev. Sci. Instrum. 1 October 2025; 96 (10): 105201 and may be found at https://doi.org/10.1063/5.0284141.

キーワード: NMR, MEMS switch, Cryogenic amplifier, HEMT, Cryogenics

刊行年月日: 2025-10-01

出版者: AIP Publishing

掲載誌:

• Review of Scientific Instruments (ISSN: 00346748) vol. 96 issue. 10 105201

研究助成金:

• Japan Society for the Promotion of Science JP23H00550
• Japan Society for the Promotion of Science JP25K00959
• Izumi Science and Technology Foundation
• Casio Science Promotion Foundation
• Takahashi Industrial and Economic Research Foundation
• Nippon Sheet Glass Foundation for Materials Science and Engineering
• Yamaguchi Scholarship Foundation

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6126

公開URL: https://doi.org/10.1063/5.0284141

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更新時刻: 2026-01-15 09:32:30 +0900

MDRでの公開時刻: 2026-01-15 12:22:38 +0900