Magnetic Properties of Iron-Cobalt Single Crystals

Single crystals of Fe-Co alloys were obtained from recrystallized pure ingots and their components of magnetization parallel to magnetic forces applied along axes of symmetry were measured by a pendulum magnetometer. It was found that the direction for easiest magnetization changes from $〈100〉$ to $〈111〉$ as the amount of cobalt in the alloy increases. This transition occurs at about 42 percent Co. This result contradicts Fowler and Powell's view concerning the dependence of direction of magnetization upon crystal structure. Some magnetic properties of polycrystalline alloys are explained. Akulov's theory for the magnetization curve of a single crystal was applied to a specimen with 70 percent Co. The agreement between theory and experiment is good in this case.