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Development of Very-Low-Temperature Millimeter-Wave Electron-Spin-Resonance Measurement System

Authors:	Y.?Fujii author-information" > author-information__contact u-icon-before" > mailto:fujii@apphy.u-fukui.ac.jp" title=" fujii@apphy.u-fukui.ac.jp" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author author-information__orcid u-icon-before icon--orcid u-icon-no-repeat" > http://orcid.org/---" itemprop=" url" title=" View OrcID profile" target=" _blank" rel=" noopener" data-track=" click" data-track-action=" OrcID" data-track-label=" " >View author&# s OrcID profile,Y.?Ishikawa,K.?Ohya,S.?Miura,Y.?Koizumi,A.?Fukuda,T.?Omija,S.?Mitsudo,T.?Mizusaki,A.?Matsubara,H.?Yamamori,T.?Komori,K.?Morimoto,H.?Kikuchi

Affiliation:	1.Research Center for Development of Far-Infrared Region, University of Fukui,Fukui,Japan;2.Department of Applied Physics, Graduate School of Engineering,University of Fukui,Fukui,Japan;3.Department of Physics,Hyogo College of Medicine,Nishinomiya,Japan;4.Department of Physics,Kyoto University,Kyoto,Japan;5.Technical Division, School of Engineering,University of Fukui,Fukui,Japan;6.KYOCERA Corporation,Kyoto,Japan;7.Furukawa Electric Co., Ltd,Tokyo,Japan;8.Nidec Corporation,Kyoto,Japan

Abstract:	We report the development of a millimeter-wave electron-spin-resonance (ESR) measurement system at the University of Fukui using a ³He/⁴He dilution refrigerator to reach temperatures below 1 K. The system operates in the frequency range of 125–130 GHz, with a homodyne detection. A nuclear-magnetic-resonance (NMR) measurement system was also developed in this system as the extension for millimeter-wave ESR/NMR double magnetic-resonance (DoMR) experiments. Several types of Fabry–Pérot-type resonators (FPR) have been developed: A piezo actuator attached to an FPR enables an electric tuning of cavity frequency. A flat mirror of an FPR has been fabricated using a gold thin film aiming for DoMR. ESR signal was measured down to 0.09 K. Results of ESR measurements of an organic radical crystal and phosphorous-doped silicon are presented. The NMR signal from ¹H contained in the resonator is also detected successfully as a test for DoMR.

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