On the Magnetization of Ferromagnetic Crystals

In a previous article a function $E_{\theta }$ is discussed. This function gives the energy of a crystal as a function of the direction of magnetization. The present paper contains photographs of plaster models representing $E_{\theta }$ for an undistorted crystal of nickel, for an undistorted crystal of iron in zero applied field, and in a field of 100 oersteds parallel to the [100], [110], and [111] axes respectively, and for an iron crystal distorted by compression and extension along the above mentioned axes. Assuming that a crystal is magnetized to saturation in the direction in which $E_{\theta }$ has a minimum, magnetization curves for crystals distorted as mentioned above are calculated and illustrated.