Abstract
We report a Fabry-Pérot resonator with spherical and flat mirrors to allow simultaneous electron-spin resonance (ESR) and nuclear magnetic resonance (NMR) measurements that could be used for double magnetic resonance (DoMR). In order to perform simultaneous ESR and NMR measurements, the flat mirror must reflect millimeter wavelength electromagnetic waves and the resonator must have a high Q value (Q > 3000) for ESR frequencies, while the mirror must simultaneously let NMR frequencies pass through. This requirement can be achieved by exploiting the difference of skin depth for the two frequencies, since skin depth is inversely proportional to the square root of the frequency. In consideration of the skin depth, the optimum conditions for conducting ESR and NMR using a gold thin film are explored by examining the relation between the Q value and the film thickness. A flat mirror with a gold thin film was fabricated by sputtering gold on an epoxy plate. We also installed a Helmholtz radio frequency coil for NMR and tested the system both at room and low temperatures with an optimally thick gold film. As a result, signals were obtained at 0.18 K for ESR and at 1.3 K for NMR. A flat-mirrored resonator with a thin gold film surface is an effective way to locate NMR coils closer to the sample being examined with DoMR.
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Acknowledgements
The authors express sincere thanks to Dr. S. Vasiliev for his great effort on constructing ESR system on DR and giving advice on making FPR. We thank Dr. Akira Matsubara (Department of Physics, Kyoto University) for his help on constructing our ESR system on the DR, and Prof. Soonchil Lee (Department of Physics, Korea Advanced Institute of Science and Technology) for providing Si:P sample. We also appreciate Prof. S. Yonezawa, Prof. Y. Hasegawa, and Dr. Y. Arata (Headquarters for Innovative Society-Academia Cooperation, University of Fukui) for their support on using the fluorescent X-ray measurement system, and KIYOKAWA Plating Industry Co., Ltd. for giving a standard thin gold film for the fluorescent X-ray measurements. This work is partly supported by JSPS KAKENHI Grant Numbers 17K05514 and 26400331 and by the Cooperative Research Program of Research Center for Development of Far-Infrared Region, University of Fukui (No. H27FIRDM011E, H28FIRDM024A, H29FIRDM015B).
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Ishikawa, Y., Ohya, K., Fujii, Y. et al. Development of Millimeter Wave Fabry-Pérot Resonator for Simultaneous Electron-Spin and Nuclear Magnetic Resonance Measurement. J Infrared Milli Terahz Waves 39, 387–398 (2018). https://doi.org/10.1007/s10762-018-0464-8
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DOI: https://doi.org/10.1007/s10762-018-0464-8