Effect of Co on twin formation and magnetic properties of Sm(Fe,Ti,V)12 alloys

Tozman, Pelin; Hrkac, G.; Patrick, C. E.; Staunton, J. B.; Saito, T.; Sasaki, T.; Ohkubo, T.; Sepehri-Amin, H.

doi:10.1016/j.scriptamat.2024.116491

Title: Effect of Co on twin formation and magnetic properties of Sm(Fe,Ti,V)₁₂ alloys

Journal Article · 06 December 2024 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2024.116491 · OSTI ID:2480498

^[1]; Hrkac, G. ^[2];

^[3]; Staunton, J. B. ^[4];

^[1];

^[1]; Ohkubo, T. ^[1];

^[1]

National Institute for Materials Science, Tsukuba (Japan)
University of Exeter, Devon (United Kingdom)
University of Oxford (United Kingdom)
University of Warwick, Coventry (United Kingdom)

Transferring the excellent intrinsic magnetic properties of SmFe₁₂-based compounds to their extrinsic properties remains the main challenge in the development of high-performance SmFe12-based permanent magnets. Twin formation is one of the reasons for the inability to achieve high coercivity and remanence. Here we have shown that the addition of Co in Sm(Fe_1-xCo_x)_10–11M_1–2 alloys, where M=Ti and V, leads to an increase in twin density. Microstructural characterizations revealed that the atomic arrangement in the twin boundary changes depending on the stabilizing element, which directly influences the local intrinsic magnetic properties. Theoretical investigations showed that the critical grain size at which twin formation can be hindered by grain size reduction decreases when the stabilizer changes from V to Ti. Furthermore, this study shows that the alloy composition influences not only the intrinsic magnetic properties but also the twin formation energy and its grain size dependence, crucial for the design of SmFe12-based permanent magnets.

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Research Organization:: Northeastern University, Boston, MA (United States)

Sponsoring Organization:: JSPS KAKENHI; JST ERATO “Magnetic Thermal Management Materials”; UK Engineering and Physical Sciences Research Council; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0022168

OSTI ID:: 2480498

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 258; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Effect of Co on twin formation and magnetic properties of Sm(Fe,Ti,V)12 alloys

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Title: Effect of Co on twin formation and magnetic properties of Sm(Fe,Ti,V)₁₂ alloys