Abstract
Bimetallic FePt nanoparticles have found application in high-density magnetic memory devices due to their large uniaxial magnetic anisotropy and overall stability [1]. These particles form an ordered L10 state, in which the Fe and Pt segregate into alternately stacked (100) planes. While it is well known that the magnetic anisotropy in this material arises from the L10 phase [1], to truly understand the functionality of this material it is necessary to determine the atomic arrangement and defect structures in the interior of the particles. To do this, we have undertaken an atomic resolution tomographic study of 8-10nm bimetallic FePt nanoparticles in the L10 state.
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