Transmission electron microscopy study on Co/Fe interdiffusion in SmCo(5)/Fe and Sm(2)Co(7)/Fe/Sm(2)Co(7) thin films

TitleTransmission electron microscopy study on Co/Fe interdiffusion in SmCo(5)/Fe and Sm(2)Co(7)/Fe/Sm(2)Co(7) thin films
Publication TypeJournal Article
Year of Publication2011
AuthorsZhang Y, Kramer MJ, Banerjee D, Takeuchi I, Liu JP
Journal TitleJournal of Applied Physics
Volume110
Pages053914
Date Published09
ISBN Number0021-8979
Accession NumberWOS:000294968600092
Abstract

We demonstrate a sharp composition transition at the interface of an as-deposited SmCo(5)/Fe bilayer, while annealing results in measurable Co/Fe interdiffusion near the boundary. For the annealed SmCo(5)/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 Sm(2)Co(7)/Fe/Sm(2)Co(7) "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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3634063]

DOI10.1063/1.3634063