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Title: Tuning magnetocrystalline anisotropy by cobalt alloying in hexagonal Fe 3Ge 1

Abstract

Here, we show using both experimental and theoretical methods that cobalt substitution in the hexagonal ferromagnet Fe 3Ge suppresses the planar magnetic anisotropy and favors a uniaxial state. Uniaxial ferromagnetism is observed at room temperature for cobalt concentrations of only a few percent, and 10% substitution fully suppresses the planar magnetic structure at least down to 5 K, with only a small effect on the magnetization and Curie temperature. First principles calculations predict strong uniaxial magnetocrystalline anisotropy and promising permanent magnet properties for higher cobalt concentrations. Finally, although these high Co concentrations were not realized experimentally, this work suggests that the rare-earth-free Fe 3Ge structure supports intrinsic magnetic properties that may enable promising permanent magnet performance.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1482435
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mcguire, Michael, Kavungal Veedu, Shanavas, Kesler, Michael S., and Parker, David S. Tuning magnetocrystalline anisotropy by cobalt alloying in hexagonal Fe3Ge1. United States: N. p., 2018. Web. doi:10.1038/s41598-018-32577-x.
Mcguire, Michael, Kavungal Veedu, Shanavas, Kesler, Michael S., & Parker, David S. Tuning magnetocrystalline anisotropy by cobalt alloying in hexagonal Fe3Ge1. United States. doi:10.1038/s41598-018-32577-x.
Mcguire, Michael, Kavungal Veedu, Shanavas, Kesler, Michael S., and Parker, David S. Fri . "Tuning magnetocrystalline anisotropy by cobalt alloying in hexagonal Fe3Ge1". United States. doi:10.1038/s41598-018-32577-x. https://www.osti.gov/servlets/purl/1482435.
@article{osti_1482435,
title = {Tuning magnetocrystalline anisotropy by cobalt alloying in hexagonal Fe3Ge1},
author = {Mcguire, Michael and Kavungal Veedu, Shanavas and Kesler, Michael S. and Parker, David S.},
abstractNote = {Here, we show using both experimental and theoretical methods that cobalt substitution in the hexagonal ferromagnet Fe3Ge suppresses the planar magnetic anisotropy and favors a uniaxial state. Uniaxial ferromagnetism is observed at room temperature for cobalt concentrations of only a few percent, and 10% substitution fully suppresses the planar magnetic structure at least down to 5 K, with only a small effect on the magnetization and Curie temperature. First principles calculations predict strong uniaxial magnetocrystalline anisotropy and promising permanent magnet properties for higher cobalt concentrations. Finally, although these high Co concentrations were not realized experimentally, this work suggests that the rare-earth-free Fe3Ge structure supports intrinsic magnetic properties that may enable promising permanent magnet performance.},
doi = {10.1038/s41598-018-32577-x},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {9}
}

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