Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films

Sharma, Shalini; Ohmer, Dominik; Zintler, Alexander; Major, M.; Radulov, I.; Kunz, Ulrike; Komissinskiy, Philipp; Xu, Bai‐Xiang; Zhang, Hongbin; Molina‐Luna, Leopoldo; Skokov, Konstantin; Alff, Lambert

doi:10.1103/physrevb.102.014435

Cited by 3 publications

(3 citation statements)

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“…Therefore, we suggest that the increased coercivity is at least partly correlated with an increased intrinsic anisotropy resulting from Cu substitution at the Co 3g sites. A similar suggestion has been made for Y(Co,Cu) 5 , a system which also behaves in thin films similar to the here investigated Sm(Co,Cu) 5 . , To corroborate this hypothesis, we discuss the described DFT-based modeling in Section . The IP magnetization measurements shown in Figure further support an increased anisotropy for SmCo 4 Cu and SmCo 3.5 Cu 1.5 .…”

Section: Results and Discussionsupporting

confidence: 82%

“…A similar suggestion has been made for Y(Co,Cu) 5 , 34 a system which also behaves in thin films similar to the here investigated Sm(Co,Cu) 5 . 18 , 35 To corroborate this hypothesis, we discuss the described DFT-based modeling in Section 3.5 . The IP magnetization measurements shown in Figure 3 further support an increased anisotropy for SmCo 4 Cu and SmCo 3.5 Cu 1.5 .…”

Section: Results and Discussionmentioning

confidence: 89%

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

Gkouzia,

Günzing,

Xie

et al. 2023

Inorg. Chem.

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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 Co3g sites not only stabilizes the formation of the SmCo5 structure but also enhances magnetic anisotropy and coercivity. Density functional theory calculations indicate that Sm(Co4Cu3g)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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Section: Results and Discussionsupporting

confidence: 82%

Section: Results and Discussionmentioning

confidence: 89%

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

Gkouzia,

Günzing,

Xie

et al. 2023

Inorg. Chem.

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“…To facilitate the simultaneous nucleation of both phases, the Sm–Co nanocomposite film is fabricated at compositions intermediate of Sm 2 Co 17 and SmCo 5 . Based on the thin-film phase diagrams established in our earlier studies, the evaporation rates of Sm and Co are chosen to be 0.16 and 0.25 Å s –1 , respectively. − The films are deposited onto (001)-Al 2 O 3 substrates at 540 °C. The results of the crystal structure investigation are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Epitaxy Induced Highly Ordered Sm₂Co₁₇–SmCo₅ Nanoscale Thin-Film Magnets

Sharma

Zintler

Günzing

et al. 2021

ACS Appl. Mater. Interfaces

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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.

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High easy-plane anisotropy Y-Co intermetallic nanoparticles for boosting gigahertz magnetic loss ability

Zhang,

Gao,

Zhao

et al. 2024

Acta Materialia

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Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films

Cited by 3 publications

References 47 publications

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

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

Epitaxy Induced Highly Ordered Sm₂Co₁₇–SmCo₅ Nanoscale Thin-Film Magnets

High easy-plane anisotropy Y-Co intermetallic nanoparticles for boosting gigahertz magnetic loss ability

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Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films

Cited by 3 publications

References 47 publications

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

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

Epitaxy Induced Highly Ordered Sm2Co17–SmCo5 Nanoscale Thin-Film Magnets

High easy-plane anisotropy Y-Co intermetallic nanoparticles for boosting gigahertz magnetic loss ability

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Product

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

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

Epitaxy Induced Highly Ordered Sm₂Co₁₇–SmCo₅ Nanoscale Thin-Film Magnets