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)
       
Fluctuation in Fig. 4 , which is caused mainly by the attachment of the alkali atoms to the cell’s wall, as shown in this figure, more alkali atoms are attached to the center of the cell’s wall, which can reduce the power of the probe beam considerably after passing through the center of cell.