Element-Specific Study of Magnetic Anisotropy and Hardening in SmCo5–xCux Thin Films

Gkouzia, Georgia; Günzing, Damian; Xie, Ruiwen; Weßels, Teresa; Kovács, András; N’Diaye, Alpha T.; Major, Márton; Palakkal, J. P.; Dunin-Borkowski, Rafal E.; Wende, Heiko; Zhang, Hongbin; Ollefs, Katharina; Alff, Lambert

doi:10.1021/acs.inorgchem.3c01768

Title: Element-Specific Study of Magnetic Anisotropy and Hardening in SmCo_5–xCu_x Thin Films

Journal Article · 21 September 2023 · Inorganic Chemistry

DOI: https://doi.org/10.1021/acs.inorgchem.3c01768 · OSTI ID:2280925

^[1]; Günzing, Damian ^[2]; Xie, Ruiwen ^[1]; Weßels, Teresa ^[3];

^[4]; N’Diaye, Alpha T. ^[5]; Major, Márton ^[1];

^[6];

^[4];

^[7]; Zhang, Hongbin ^[1]; Ollefs, Katharina ^[7];

^[1]

Technical Univ. of Darmstadt (Germany)
University of Duisburg-Essen (Germany); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of Duisburg-Essen (Germany); Forschungszentrum Juelich (Germany)
Forschungszentrum Juelich (Germany)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Technical Univ. of Darmstadt (Germany); Gottingen Univ. (Germany)
University of Duisburg-Essen (Germany)

This work investigates the effect of copper substitution on the magnetic properties of SmCo₅ thin films synthesized by molecular beam epitaxy. A series of thin films with varying concentrations of Cu were grown under otherwise identical conditions to disentangle structural and compositional effects on the magnetic behavior. The combined experimental and theoretical studies show that Cu substitution at the Co_3g sites not only stabilizes the formation of the SmCo₅ structure but also enhances magnetic anisotropy and coercivity. Density functional theory calculations indicate that Sm(Co₄Cu_3g)₅ possesses a higher single-ion anisotropy as compared to pure SmCo₅. In addition, X-ray magnetic circular dichroism reveals that Cu substitution causes an increasing decoupling of the Sm 4f and Co 3d moments. Scanning transmission electron microscopy confirms predominantly SmCo₅ phase formation and reveals nanoscale inhomogeneities in the Cu and Co distribution. Our study based on thin film model systems and advanced characterization as well as modeling reveals novel aspects of the complex interplay of intrinsic and extrinsic contributions to magnetic hysteresis in rare-earth-based magnets, i.e., the combination of increased intrinsic anisotropy due to Cu substitution and the extrinsic effect of inhomogeneous elemental distribution of Cu and Co.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2280925

Journal Information:: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 40 Vol. 62; ISSN 0020-1669

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Energy
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Layers
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Title: Element-Specific Study of Magnetic Anisotropy and Hardening in SmCo5–xCux Thin Films

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Title: Element-Specific Study of Magnetic Anisotropy and Hardening in SmCo_5–xCu_x Thin Films