LAUSR

A Spin-Exchange Relaxation-Free comagnetometer is a promising high-precision gyroscope as its inertial measurement sensitivity can rival that of existing technologies. The magnetic field error is one of the main factors that limits the long-term stability of the comagnetometer. The steady state response and frequency response models of a K-Rb-21Ne comagnetometer is modified by considering the the spin-exchange rate between the electron spins and nuclear spins. The modified models are used to redefine the bias magnetic sensitivity of the K-Rb-21Ne comagnetometer and the suppression method of low frequency magnetic field error is proposed. We demonstrate the magnetic drift suppression method proposed in the paper by optimizing the cell temperature and pump laser power density. This study is helpful to improve the rotation measurement performance the K-Rb-21Ne comagnetometer.