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Development of Very-Low-Temperature Millimeter-Wave Electron-Spin-Resonance Measurement System |
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| Authors: | |
| Institution: | 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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