A1 Journal article (refereed), original research

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


Open Access publication


Publication Details

Authors: Pussi K., Barbiellini B., Ohara K., Yamada H., Dwivedi J., Bansil A., Gupta A., Kamali S.

Publisher: IOP Publishing: Hybrid Open Access

Publication year: 2021

Language: English

Related journal or series: Journal of Physics: Condensed Matter

Volume number: 33

Issue number: 39

ISSN: 0953-8984

eISSN: 1361-648X

JUFO level of this publication: 2

Digital Object Identifier (DOI): http://dx.doi.org/10.1088/1361-648X/ac1238

Permanent website address: https://iopscience.iop.org/article/10.1088/1361-648X/ac1238

Open Access: Open Access publication

Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2021082343897


Abstract

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 Co20Fe61B19 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 Fe23B6 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.


Research Areas

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Last updated on 2021-06-09 at 11:00