Abstract: In electromagnetics, the principles of generating magnetic fields in space with a magnetic dipole layer or a current carrying coil are equivalent, which indicates that the magnetic moment of a soft magnetic sample can be equivalent to the magnetic moment of a current carrying coil. A new method of magnetic moment measurement based on the sample’s displacement is reported. Both a soft magnetic sample and a rubidium bubble are placed along the z-axis of a magnetic shielding cylinder, and the direction of the magnetic field generated by the sample at the position of the rubidium bubble is parallel to the z-axis. The magnitude of the magnetic field generated by the sample at the position of the rubidium bubble is defined as B', and the increasing distance between the sample and the rubidium bubble is defined as （r₀+x）, where r₀ is the initial distance and x is an increase in distance. The value of the sample’s magnetic moment is 2π/（μ₀k^3/2）, where μ₀ is the vacuum magnetic permeability, and k is the coefficient linearly fitted by the experimental curve of （1/B'）^2/3 changing with （r₀+x）². The magnetic moment of a current carrying coil and the saturation remanent magnetic moment of a permalloy soft magnetic sample are measured by using a pump-probe rubidium atomic magnetometer. The experimental value of the current carrying coil’s magnetic moment is 0.000265 A·m², while the theoretical value is 0.000252 A·m². The relative error between the experimental value and theoretical value is 5.2%, which means that the new method of magnetic moment measurement is effective. Due to the fact that B' is proportional to the soft magnetic sample’s magnetic moment, the remanent magnetization hysteresis loops and the magnetic hysteresis loops of the soft magnetic sample are calibrated using its saturation remanent magnetic moment at a constant temperature.