Magnetic and Crystalline Properties of Hexagonal Co-Fe Alloys

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Abstract
The X‐ray study revealed that the Co‐Fe alloy system in the range 0 to 8 at.% Fe is classified into three regions with different phases; (1) the ABAB‐h.c.p. below 1 at.% Fe, (2) the ABAC‐double h.c.p. between 1 and ∼4 at.% Fe and (3) the ABC‐f.c.c. above ∼4 at.% Fe. It was found that discontinuous increases in saturation moment take place at these phase boundaries. The value of the saturation moment extrapolated to the zero Fe content for the double h.c.p. phase was intermediate between values for the h.c.p. and f.c.c. phases. The observed change in saturation moment per Fe atom can be explained by the rigid band model. The direction of easy magnetization of the magnetocrystalline anisotropy was found to change from the c‐axis for the h.c.p. phase into the c‐plane for the double h.c.p. phase. Domain patterns with double walls were observed on the c‐plane of the double h.c.p. crystals. The temperature dependence of Co59 NMR for domain and domain wall in 0.43 at.% Fe alloy revealed the spin rotations due to a change in anisotropy. For 1.04 at.% Fe alloy, the observed two different resonances are thought to be due to Co59 nuclei on two different lattice sites in the double h.c.p. structure.
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