In-situ measurement of magnetic field gradient in a magnetic shield by a spin-exchange relaxation-free magnetometer*
Fang Jian-Chenga), Wang Taoa)†, Zhang Hongb), Li Yanga), Cai Hong-Weia)
       
Magnetic field gradients along the z direction, measured with pump beam’s power of 60 mW (solid circle), 80 mW (solid triangle), and 100 mW (solid square).