Stabilizing interface of SmCo5/Co nanocomposites by graphene shells

Ma, Zhenhui; Du, Haiping

doi:10.1007/s12598-021-01907-w

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…[ 5–7 ] As an important medium to achieve the conversion between electrical and mechanical energy, they become especially key materials in artificial intelligence, unmanned aerial vehicle, intelligent robot and electromobile. [ 8–12 ] Some of them own the easy‐plane crystal structure such as Sm 2 Fe 17 , Ce 2 Fe 17 , making them show soft magnetic feature with high M s , high resonance frequency as well as permeability. [ 13 ] Thus, these easy‐plane materials display high Snoek limit due to the relationship: f r ( µ i −1) = (2γ/3)4 πM s ( H θ / H φ ) 1/2 , where f r is natural resonance frequency, µ i is the initial permeability, γ is a gyromagnetic ratio (≈ 2.8 MHz/Oe), H θ and H φ are the out‐of‐plane anisotropy field and in‐plane anisotropy field, respectively.…”

Section: Introductionmentioning

confidence: 99%

A General Method for the Large‐Scale Preparation of Multifunctional Magnetic Sm‐Fe/Co Nanomaterials

Liu

Luo³

2023

Adv Funct Materials

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A general method is reported to prepare single crystal Sm‐Fe/Co nanoparticles (NPs) on a tens of grams scale without Ca‐reduction process. The preparation starts with the fabrication of size‐controllable SmH2 NPs via evaporation‐condensation route, and then Co NPs produced from solvothermal approach are assembled with SmH2 to form SmH2/Co nanocomposites, which are directly annealed at 700 °C for 1.5 h, yielding 160 ± 15 nm SmCo5 single crystal NPs. Compared with conventional Ca‐reduction process, the method allows more low annealing temperature, and avoids the employment of Ca and the corresponding water washing process, leading to the stable SmCo5 NPs without obvious oxidation. The SmCo5 NPs show a large coercivity of 35.4 kOe and high saturated magnetic moment of 86.2 emu g−1. Furthermore, the method is extended to synthesize Sm2Fe17 NPs, which exhibits good electromagnetic wave absorption performance with a minimum reflection loss of −45.2 dB and the effective absorption bandwidth of 5.61 GHz (9.22–14.83 GHz) at 1.2 mm. More importantly, the method is very suitable to large‐scale synthesis. One synthesis can generate ≈ 42.25 g of SmCo5 or 43.30 g of Sm2Fe17 NPs, which demonstrates a promising novel strategy to scale up preparation of RE‐Co/Fe NPs for multifunction magnetic applications.

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Section: Introductionmentioning

confidence: 99%

A General Method for the Large‐Scale Preparation of Multifunctional Magnetic Sm‐Fe/Co Nanomaterials

Liu

Luo³

2023

Adv Funct Materials

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“…Nanomagnets, with strong magnetic properties and small volume, have been considered to be the key materials to magnetic and electronic devices that exhibit important applications in artificial intelligence, intelligent robots, wind turbines, and electromobiles [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Compared with rare-earth-based nanomagnets, the rare-earth-free nanomagnets earn more attention for their high chemical stability and low cost [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

A Self-Assembly of Single Layer of Co Nanorods to Reveal the Magnetostatic Interaction Mechanism

Zhang

et al. 2022

Nanomaterials

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In this work, we report a self-assembly method to fabricate a single layer of Co nanorods to study their magnetostatic interaction behavior. The Co nanorods with cambered and flat tips were synthesized by using a solvothermal route and an alcohol–thermal method, respectively. Both of them represent hard magnetic features. Co nanorods with cambered tips have an average diameter of 10 nm and length of 100 nm with coercivity of 6.4 kOe, and flat-tip nanorods with a 30 nm diameter and 100 nm length exhibit a coercivity of 4.9 kOe. They are further assembled on the surface of water in assistance of surfactants. The results demonstrate that the assembly type is dependent on the magnetic induction lines direction. For Co nanorods with flat tips, most of magnetic induction lines are parallel to the length direction, leading to an assembly that is tip to tip. For Co nanorods with cambered tips, they are prone to holding together side by side for their random magnetic induction lines. Under an applied field, the Co nanorods with flat tips can be further aligned into a single layer of Co nanorods. Our work gives a possible mechanism for the magnetic interaction of Co nanorods and provides a method to study their magnetic behavior.

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The chemical fabrication of heterostructured SmCo5/Fe nanocomposites

Zhang

2022

J Mater Sci: Mater Electron

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Stabilizing interface of SmCo5/Co nanocomposites by graphene shells

Cited by 7 publications

References 41 publications

A General Method for the Large‐Scale Preparation of Multifunctional Magnetic Sm‐Fe/Co Nanomaterials

A General Method for the Large‐Scale Preparation of Multifunctional Magnetic Sm‐Fe/Co Nanomaterials

A Self-Assembly of Single Layer of Co Nanorods to Reveal the Magnetostatic Interaction Mechanism

The chemical fabrication of heterostructured SmCo5/Fe nanocomposites

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