Epitaxy Induced Highly Ordered Sm2Co17-SmCo5Nanoscale Thin-Film Magnets

Shalini Sharma*, Alexander Zintler, Damian Günzing, Johanna Lill, Debora Motta Meira, Robert Eilhardt, Harish Kumar Singh, Ruiwen Xie, Georgia Gkouzia, Márton Major, Iliya Radulov, Philipp Komissinskiy, Hongbin Zhang, Konstantin Skokov, Heiko Wende, Yukiko K. Takahashi, Katharina Ollefs, Leopoldo Molina-Luna, Lambert Alff

*この研究の対応する著者

研究成果: Article査読

抄録

Utilizing the molecular beam epitaxy technique, a nanoscale thin-film magnet of c-axis-oriented Sm2Co17 and SmCo5 phases is stabilized. While typically in the prototype Sm(Co, Fe, Cu, Zr)7.5-8 pinning-type magnets, an ordered nanocomposite is formed by complex thermal treatments, here, a one-step approach to induce controlled phase separation in a binary Sm-Co system is shown. A detailed analysis of the extended X-ray absorption fine structure confirmed the coexistence of Sm2Co17 and SmCo5 phases with 65% Sm2Co17 and 35% SmCo5. The SmCo5 phase is stabilized directly on an Al2O3 substrate up to a thickness of 4 nm followed by a matrix of Sm2Co17 intermixed with SmCo5. This structural transition takes place through coherent atomic layers, as revealed by scanning transmission electron microscopy. Highly crystalline growth of well-aligned Sm2Co17 and SmCo5 phases with coherent interfaces result in strong exchange interaction, leading to enhanced magnetization and magnetic coupling. The arrangement of Sm2Co17 and SmCo5 phases at the nanoscale is reflected in the observed magnetocrystalline anisotropy and coercivity. As next-generation permanent magnets require designing of materials at an atomic level, this work enhances our understanding of self-assembling and functioning of nanophased magnets and contributes to establishing new concepts to engineer the microstructure for beyond state-of-the-art magnets.

本文言語English
ページ(範囲)32415-32423
ページ数9
ジャーナルACS Applied Materials and Interfaces
13
27
DOI
出版ステータスPublished - 2021 7 14
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)

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