Tomohisa Aita received his B.Eng. in 2025 and is currently a master's student at the University of Tsukuba, conducting his research at the National Institute for Materials Science (NIMS). His research focuses on the development of NV-center diamond quantum sensors for detecting pressure-induced superconductivity in diamond anvil cells.

Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors for local magnetic measurements under high pressure [1]. Integrating NV sensors into a diamond anvil cell (DAC) requires the growth of NV-doped diamond films on diamond anvils. Previous studies have shown that nitrogen supply [2] and crystal orientation [3] affect the properties of CVD-grown NV ensembles. In this work, we grew NV-doped diamond films by microwave plasma CVD (MPCVD) and investigated the effects of substrate temperature, CH4 flow rate, N₂ flow rate, and crystal orientation. The films were evaluated by photoluminescence spectroscopy, and their magnetic sensing capability was confirmed by resolving eight ODMR resonances corresponding to the four NV orientations under an applied magnetic field.

1. K. Y. Yip et al., Science 366, 1355–1359 (2019) DOI: 10.1126/science.aaw4278
2. T. Luo et al., New J. Phys. 24, 033030 (2022) DOI: 10.1088/1367-2630/ac58b6
3. C. Osterkamp et al., Sci. Rep. 9, 5786 (2019) DOI: 10.1038/s41598-019-42314-7