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Optically detected magnetic resonance of silicon vacancies in 4H-SiC at elevated temperatures toward magnetic sensing under harsh environments

Authors :
Shu Motoki
Shin-ichiro Sato
Seiichi Saiki
Yuta Masuyama
Yuichi Yamazaki
Takeshi Ohshima
Koichi Murata
Hidekazu Tsuchida
Yasuto Hijikata
Source :
Journal of Applied Physics. 133:154402
Publication Year :
2023
Publisher :
AIP Publishing, 2023.

Abstract

Negatively charged silicon vacancy (VSi−) defects in silicon carbide are expected to be used for magnetic sensors under harsh environments, such as space and underground due to their structural stability and potential for high-fidelity spin manipulation at high temperatures. To realize VSi− based magnetic sensors operating at high temperatures, the temperature dependence of optically detected magnetic resonance (ODMR) in the ground states of VSi− defects, which is the basic principle of magnetic sensing, should be systematically understood. In this work, we demonstrate the potential of VSi− magnetic sensors up to at least 591 K by showing the ODMR spectra with different temperatures. Furthermore, the resonance frequency of the ground level was independent of temperature, indicating the potential for calibration-free magnetic sensors in temperature-varying environments. We also characterize the concentration of VSi− defects formed by electron irradiation and clarify the relationship of magnetic sensing sensitivity to VSi− concentration and find that the sensing sensitivity increases linearly with VSi− concentration up to at least 6.0 × 1016 cm−3. The magnetic sensitivity at a temperature above 549 K was reduced by half as compared to that at 300 K. The results pave the way for the use of a highly sensitive VSi−-based magnetic sensor under harsh environments.

Subjects

Subjects :
General Physics and Astronomy

Details

ISSN :
10897550 and 00218979
Volume :
133
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........cd0214b92740eb9f07e955ecd9bf07a8
Full Text :
https://doi.org/10.1063/5.0139801