MAGNETIC sensing technology is of g

MAGNETIC sensing technology is of great significance in the fields of magnetic navigation, magnetic anomaly monitoring, nondestructive testing of precision devices, magnetic field measurement of biological cells, and medical nuclear magnetic resonance. In order to improve the accuracy of magnetic field measurement, superconducting quantum interferometers, magnetic resonance force microscopes and other instruments have been researched and manufactured. Although these technologies have improved the sensitivity of magnetic field measurement, they require low-temperature cooling, vacuum and other environments, which greatly limit their concrete application. In recent years, due to its unique crystal structure and energy level characteristics, the diamond NV centers has been widely used in quantum computing [1]-[4], quantum communication [5], [6], quantum precision sensing [7]-[11] and experimental research on fundamental issues of quantum physics. Especially, NV centers has the advantages of adjustable spin state, high sensitivity, non-destructive and stable quantum state, and has become a hot spot in the field of magnetic sensing research [12]-[17].