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TEM observation of the segregated microstructure in sputtered Co–Cr films was conducted. The specific segregated microstructure was observed in the film composition range of 15.3–24.3 at%Cr–Co. The results present a new model for the origin of the segregation where two-phase separation into magnetic and non-magnetic phases occurs in a single hcp phase. The ferromagnetic Co-rich regions in a crystallite are supposed to be embedded in nonmagnetic Cr-rich matrix, with a wall-like figure perpendicular to the substrate plane.
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Maeda et al. (1986) studied this question.
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