Design and realization of a weak magnetic fast electric heating chip

Abstract

In a high-sensitivity atomic magnetometer, increasing the temperature of the vapor cell causes higher polarized atomic density, which enhances the intensity of the output signal. Therefore, it is essential to precisely control the temperature of the vapor cell. Based on the principle of electric heating and reverse magnetic cancellation, miniature weak magnetic electric heating chips of single-layer and double-layer structure are designed. By measuring the magnetic flux density at different distances and currents, it can be proved that the chips suppress the magnetic field. The experiment results show that the double-layer chip is better than the single-layer chip in respect of magnetic suppression and temperature response. The magnetic flux density introduced by the current at 5 mm from the chip is 0.0722 nT mA−1. These results show that a high-precision heating method for the atomic vapor cell can be realized by the double-layer meander structure, which provides a simple and fast electric heating scheme for atomic polarization.