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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on FeCoB by Materials Project

CoFeB is Khatyrkite-derived structured and crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional. Fe2+ is bonded in a 7-coordinate geometry to three equivalent Fe2+ and four equivalent B3- atoms. There are one shorter (2.32 Å) and two longer (2.42 Å) Fe–Fe bond lengths. All Fe–B bond lengths are 2.17 Å. Co1+ is bonded in a 4-coordinate geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.14 Å. B3- is bonded in a 10-coordinate geometry to four equivalent Fe2+, four equivalent Co1+, and two equivalent B3- atoms. Both B–B bond lengths are 2.10 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Here we discuss the atomic structure of amorphous ferromagnetic FeCoB alloys, which are used widely in spintronics applications. Specifically, we obtain the pair-distribution functions for various atomic pairs based on high-energy x-ray diffraction data taken from an amorphous Co 20 Fe 61 B 19 specimen. We start our reverse Monte Carlo cycles to determine the disordered structure with a two-phase model in which a small amount of cobalt is mixed with Fe 23 B 6 as a second phase. The structure of the alloy is found to be heterogeneous, where the boron atoms drive disorder through the random occupation of the atomic network. Our analysis also indicates the presence of small cobalt clusters that are embedded in the iron matrix and percolating the latter throughout the structure. This morphology can explain the enhanced spin polarization observed in amorphous magnetic materials.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗