Gyromagnetic Ratio of Iron at Low Magnetic Intensities

It is shown that the measured value for the gyromagnetic ratio of pure iron as determined by a direct magneto-mechanical method, undergoes a change for low values of the induced magnetic intensity. The effective value of this ratio extrapolated to zero intensity, checks the value which is theoretically expected from a consideration of recent ferromagnetic resonance experiments. For higher values of the induced magnetic intensity, the gyromagnetic ratio approaches a constant value which checks the value obtained in previous investigations based upon the Einstein-de Haas effect.