Abstract
We demonstrate a sharp composition transition at the interface of an as-deposited SmCo5/Fe bilayer, while annealing results in measurable Co/Fe interdiffusion near the boundary. For the annealed SmCo5/Fe bilayer, phase separation occurs within the bcc-layer, forming regions with 3 different Fe:Co ratios. Depositing Fe between Sm-Co layers provides a realistic model for bulk systems. Co/Fe interdiffusion was observed by TEM in an annealed Sm2Co7/Fe/Sm2Co7 “sandwich” thin film, confirming Co/Fe interdiffusion as the main mechanism controlling phase chemistry in Sm-Co/Fe bulk nanocomposites. The degree of Co/Fe interdiffusion is primarily chemically driven, and the approximate 20% Fe substitution for Co is thermodynamically stable.
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