Quantification of L10 phase volume fraction in annealed [Fe/Pt]n multilayer films

Yao, Bo; Coffey, Kevin R.
February 2009
Journal of Applied Physics;Feb2009, Vol. 105 Issue 3, pN.PAG
Academic Journal
The heat treatment of [Fe/Pt]n multilayer films is a promising approach to form the L10 FePt phase at a reduced temperature, which is of interest for applications as high-density magnetic recording media and high-energy permanent magnets. The volume fraction of the L10 FePt phase in the annealed films strongly influences their magnetic properties. This paper introduces a novel method based on hollow cone dark field transmission electron microscopy imaging to quantify the L10 FePt phase volume fraction. This method is used to characterize two sets of [Fe/Pt]n multilayer films with varying deposition temperature and periodicity. It was found that both the deposition temperature and bilayer periodicity are significant to the structure and magnetic properties of annealed films and to the extent to which the L10 phase is formed. A correlation between L10 phase volume fraction, grain size, and magnetic properties was also observed.


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