Ring laser gyros are fairly well known, but there's another way you can make a gyro with no mechanically spinning parts using the right combination of magnets.

Ring laser gyros are fairly well known, but there's another way you can make a gyro with no mechanically spinning parts using the right combination of magnets. This paper describes an experimental apparatus that incidentally serves as a solid-state gyrocompass: https://arxiv.org/abs/hep-ph/0606218 https://arxiv.org/abs/hep-ph/0606218 (Disclaimer: I did my PhD in this group but started there after this paper was published.)