Induced Magnetic Anisotropy and Ordering in Ni—Fe Single Crystals

Abstract
The temperature dependence of the induced magnetic anisotropy by magnetic annealing has been measured in Ni—Fe single crystals containing 91.0%, 74.6% (Ni3Fe), 69.0%, and 65.6% nickel. The ratios of the coefficients of the induced anisotropy energy, k2/k1, were almost constant with annealing temperature and had the value of 8.7 for Ni3Fe, 3.9 for 69.0% Ni and 2.3 for 65.0% Ni in disordered state while these values changed remarkably when specimens were annealed just below the order—disorder transition temperatures. This result cannot be explained by the atomic orientation theory based on the crystal structure even though higher approximation methods are used.

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