Ferromagnetic Anisotropy in Nickel-Cobalt-Iron Crystals at Various Temperatures

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Abstract
Single crystals of ternary alloys of nickel, cobalt and iron with forty percent nickel or more have been examined, with a pendulum magnetometer, for ferromagnetic anisotropy. All alloys in this region have face-centered cubic structures, like that of nickel. A region of low anisotropy, for nearly equal cobalt and iron contents, appears to be connected with the points where binary alloys of nickel and cobalt on one side and of nickel and iron on the other side change their anisotropy types. Measurements were made in all cases at room temperature, at about 200°C, and at about 400°C. At the higher temperatures anisotropy of either type generally diminishes and, in the region of low anisotropy, the principal anisotropy constant may change sign. The previously reported data for the binary alloys and single components in this system are recomputed and presented so as better to show the boundaries of the ternary field.