The effects of Cu doping on crystalline structure and magnetic properties of SmCo5-xCux thin films grown on Ru (0002)

Yin, Shengyong; Wang, H.; Zhao, Helen; Jiang, Yong; Wang, Jianping

doi:10.1063/1.4833558

Cited by 8 publications

(3 citation statements)

References 21 publications

(16 reference statements)

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“…An obstacle is the very limited equilibrium solubility of Fe in the SmCo 5 phase, which is metastable even without Fe addition. Other additives, such as Ti, Cu, Zr, Nb, and Ni, which were also considered from a very early stage [5,16,17,[18][19][20][21][22][23][24][25][26], often improve coercivity but tend to further reduce the magnetization and can therefore only be used in small amounts. A breakthrough occurred with the recognition that Co doping with Cu enhances the solubility of Fe and eventually leads to the formation of a high-magnetization Sm 2 (Co 1−x Fe x ) 17 phase surrounded by Sm(Co, Cu) 5 grain boundaries [3,16,27,28].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy and orbital moment in Sm-Co permanent magnets

et al. 2019

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Structural and magnetic properties of iron-free and iron-substituted SmCo5 have been investigated theoretically and experimentally. The nanocrystalline ribbons of SmCo5−xFex(0≤x≤2), which were produced by rapid solidification, crystallize in the hexagonal CaCu5 structure for x≤0.75. Small Fe additions (x=0.25) substantially improve the coercivity, from 0.45 to 2.70 T, which we interpret as combined intrinsic and extrinsic effect. Most of our findings are consistent with past samarium-cobalt research, but some are at odds with findings that have seemingly been well established through decades of rare-earth transition-metal research. In particular, our local spin-density approximation with Hubbard parameter calculations indicate that the electronic structure of the Sm atoms violates Hund's rules and that the orbital moment is strongly quenched. Possible reasons for the apparent disagreement between theory and experiment are discussed. We explicitly determine the dependence of the Sm 4f charge distribution, arguing that an accurate densityfunctional description of SmCo5 is a challenge to future research.

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Section: Introductionmentioning

confidence: 99%

Anisotropy and orbital moment in Sm-Co permanent magnets

et al. 2019

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“…Cu is usually used as a dopant in SmCo 5 thin films grown onto Cr or Ru buffer layers. , As mentioned above, in this work, no additional underlayers have been used, and the SmCo 5– x Cu x films were deposited directly on top of Al 2 O 3 substrates. The hysteresis loops of the out-of-plane direction are shown in Figure .…”

Section: Results and Discussionmentioning

confidence: 99%

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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“…In order to stable the SmCo 7 into TbCu 7 structure, another element such as Zr, Hf, Nb, Ti, Ga, etc. are introduced into the matrix to increase its intrinsic magnetic properties [30,31]. Various element such as Zr are also included for the enhancement of the anisotropy field and the coercivity of SmCo 7 powders [17].…”

Section: Properties Of Rare Earth Magnetsmentioning

confidence: 99%

Current Advances in Nanocrystalline Rare Earth Based Modern Permanent Magnet

Ranjan Sahu

2024

Modern Permanent Magnets - Fundamentals and Applications

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Modern permanent magnets are the essential materials for many industries and technologies. All strong permanent magnets that contain rare earth element have wide range of application. Different processing technique, material and manufacturing methods are used to produce different types of rare earth magnets. New developments and improvement in properties are proposed based on the addition of nanocrystalline materials to address the effectiveness of rare earth magnets which is beneficial for different application. This chapter reviews the fundamental aspect and progress of rare earth modern magnet along with the need of essential key factor for future development of cost-effective rear earth permanent magnets.

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The effects of Cu doping on crystalline structure and magnetic properties of SmCo5-xCux thin films grown on Ru (0002)

Cited by 8 publications

References 21 publications

Anisotropy and orbital moment in Sm-Co permanent magnets

Anisotropy and orbital moment in Sm-Co permanent magnets

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

Current Advances in Nanocrystalline Rare Earth Based Modern Permanent Magnet

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The effects of Cu doping on crystalline structure and magnetic properties of SmCo5-xCux thin films grown on Ru (0002)

Cited by 8 publications

References 21 publications

Anisotropy and orbital moment in Sm-Co permanent magnets

Anisotropy and orbital moment in Sm-Co permanent magnets

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

Current Advances in Nanocrystalline Rare Earth Based Modern Permanent Magnet

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