Robustness of magnetocrystalline anisotropy and coercivity in Fe–Co–B

Liu, X. B.; Nlebedim, I. C.

doi:10.1016/j.physb.2024.415914

Robustness of magnetocrystalline anisotropy and coercivity in Fe–Co–B

Journal Article · Sat Mar 30 00:00:00 EDT 2024 · Physica. B, Condensed Matter

DOI:https://doi.org/10.1016/j.physb.2024.415914· OSTI ID:2340150

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Ames Laboratory (AMES), Ames, IA (United States). Critical Materials Institute (CMI)

As a potential candidate for critical chemical element free permanent magnet, (Fe_0.7Co_0.3)₂B, shows promising intrinsic magnetic properties, including large magnetization, high Curie temperature and moderate magnetocrystalline anisotropy (MCA). Still, the coercivity that has been achieved is relatively low. To understand and improve coercivity, here we study the robustness of MCA related to the fluctuation of chemical composition and the structural distortion and its effect on coercivity in (Fe_0.7Co_0.3)₂B from first principles DFT (density functional theory) calculation and micromagnetic simulation. A fluctuation of cobalt content of 10%, or 1% isotropic lattice strain, or 2% tetragonal distortion reduces MCA energy up to 30%. By considering randomly distributed local MCA energy reduction up to 30%, the calculated coercivity of anisotropic bulk magnets reduced from 3.6 kOe to 2.2 kOe. Rational microstructure design, such as grain size refinement and development of strong crystal texture of MCA easy-axis (i.e., degree of alignment for (Fe_0.7Co_0.3)₂B grains), can enhance coercivity and mitigate the effect of local MCA reduction. In addition to acceptable intrinsic magnetic properties, the promising hard magnetic phase needs good MCA robustness to facilitate the development of practical magnets.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2340150

Alternate ID(s):: OSTI ID: 2369139

Report Number(s):: IS-J--11,295

Journal Information:: Physica. B, Condensed Matter, Journal Name: Physica. B, Condensed Matter Vol. 683; ISSN 0921-4526

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Robustness of magnetocrystalline anisotropy and coercivity in Fe–Co–B

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Figures / Tables (9)

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