Magnetic properties of exchange coupled SmCo5/FeCo composite particles synthesized by magnetic self-assembly

Ma, Chuantao

doi:10.1016/j.cplett.2018.02.042

Cited by 13 publications

(4 citation statements)

References 30 publications

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“…Generally, saturation magnetization (M s ) increases as the amount of soft magnet (e.g., Fe, Co, FeCo) increases in a hard−soft magnetic system. 19,26 Such a tendency was evident in our study. As the plating time increased, the FeCo layer became thicker, leading to an increase in M 25kOe .…”

Section: ■ Results and Discussionsupporting

confidence: 82%

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets

Lee¹,

Kim

et al. 2019

ACS Appl. Mater. Interfaces

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Rare-earth-based core–shell spring nanomagnets have been intensively studied in the permanent magnet industry. However, the inherent agglomeration characteristics of zero-dimensional (0-D) magnetic nanoparticles are an issue in practical fabrication of magnetic nanocomposites due to deterioration in exchange-coupling interactions, resulting in inferior magnetic performance. Here, with an aim to overcome the structural limitations, we report a new type of SmCo/FeCo core–shell nanomagnet with a well-dispersed one-dimensional (1-D) structure prepared by a combination of electrospinning and electroless plating processes. An FeCo layer with a tailored thickness on nanoscale SmCo was produced to achieve a sufficient exchange-coupling effect. The influence of electroless plating time on the microstructure of fibers was discussed, and comparisons were made as a function of the magnet shape. A 1-D SmCo/FeCo spring nanomagnet having a core diameter ranging from 150 to 200 nm and a shell thickness of 15–20 nm showed a potent exchange-coupling effect compared with its 0-D counterpart. This effectively reduced self-aggregation and further showed a remarkable enhancement in (BH)max (above 45.7%). We think that this novel structure marks a new era in the exchange-spring magnet industry and may overcome the limitations of traditional core–shell nanomagnets.

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Section: ■ Results and Discussionsupporting

confidence: 82%

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets

Lee¹,

Kim

et al. 2019

ACS Appl. Mater. Interfaces

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“…Many efforts have been made to synthesize exchange-spring nanomagnets using different ex situ approaches including conventional physical techniques such as mechanical mixing with individual magnetic powder, − self-assembly, − and electroless deposition of a soft magnet on a hard magnet. − Such magnetic composites commonly possess a predominance of a long-range dipolar interaction of the hard–hard and soft–soft magnetic phases based on the uneven coupling between the hard and soft magnetic phases, resulting in enervating the exchange-coupling interaction and further deteriorating magnetic performance . Moreover, even the use of mechanical power for powder mixing or a strong acidic solution for electroless coatings causes fast oxidation of the metallic magnets and, at worst, phase decomposition into a nonmagnetic phase because metal magnets are vulnerable to harsh process conditions …”

Section: Introductionmentioning

confidence: 99%

Phase- and Composition-Tunable Hard/Soft Magnetic Nanofibers for High-Performance Permanent Magnet

Lee

Hwang

et al. 2020

ACS Appl. Nano Mater.

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An exchange-spring magnet is a next-generation permanent magnetic model that possesses a synergistic effect of single-phased hard and soft magnets, thereby giving rise to enhanced magnetic performance. However, in spring magnet preparation thus far, it has remained a challenge to manipulate the magnetic properties via the exchange-coupling effect due to the lack of a synthetic method that enables the hard/soft interfacial magnetic interaction in a homogeneous manner. Here, we report an in situ approach for the synthesis of a phase-and composition-tunable SmCo-based spring magnet based on a binary phase system. This is the first reported systematic and prospective approach to spring magnet preparation. An electrospinning technique with the use of a composition-tunable precursor enables the fabrication of bimagnetic nanofibers with a precisely controlled hard/soft magnet volume ratio (0 to 100%) and a good number of interfacial sites, leading to an effective magnetic coupling interaction. On the basis of a microstructural study and qualitative magnetic measurements, we demonstrate an enhancement in magnetic performance for binary-phased fibers and clearly manifest the elucidation of the exchange-coupling effect between nanograins across the interface in the one-dimensional nanomagnet. We envision that this work can provide a potential approach to develop exchange-coupled spring magnet and moreover, offering an ideal model to understand the nanomagnetism of a well-constructed one-dimensional spring nanostructure.

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“…To simultaneously possess high coercivity and high saturation magnetization, there have been many studies about the combination of Fe-Co and rare earth permanent magnetic alloys. Chuanto et al [ 23 ] fabricated SmCo 5 /FeCo core–shell composite materials, showing how the magnetic energy product of a composite material with 10 wt.% FeCo increased by 25% compared to a single hard magnetic phase SmCo 5 . Cui et al [ 24 ] prepared Sm 2 Co 17 /Fe 7 Co 3 duplex-phase magnetic nanowires with excellent shape anisotropy via alternating electrodeposition.…”

Section: Introductionmentioning

confidence: 99%

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

et al. 2023

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To solve the problem of the low coercivity of Nd-Fe-B-based nanowires impeding their application in magnetic storage media, highly ordered Nd-Fe-B/Fe-Co composite nanowires were fabricated in an anodic alumina template by means of the alternating electrochemical deposition method. In this paper, the effect of soft and hard magnetic phase compositing on the magnetic properties of Nd-Fe-B-based nanowires was investigated, and the coercivity improvement mechanism was demonstrated. The results show that after annealing at 600 °C for 2 h, Nd-Fe-B/Fe-Co nanowires crystallize into a multiphase structure containing a hard Nd2(Fe, Co)14B phase and soft NdB4, NdB6, Fe7Nd, and Fe7Co3 phases. It is characterized that the Nd2(Fe, Co)14B phase preferentially nucleates, followed by NdB4 + NdB6 + Fe7Nd, while Fe7Co3 has been formed in as-deposited nanowires. The existence of a Nd2(Fe, Co)14B phase with high anisotropy fields, the remanence enhancement effect produced by exchange coupling between hard–soft magnetic phases, and the pinning effect between different phases make the composite nanowires approximately exhibit single hard magnetic phase characteristics with coercivity and remanence ratio as high as 4203.25 Oe and 0.89. The results indicate that synthesizing Nd-Fe-B/Fe-Co exchange-coupled composite nanowires via alternating electrodeposition is an effective way to optimize the magnetic performance of Nd-Fe-B-based nanowires.

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Magnetic properties of exchange coupled SmCo5/FeCo composite particles synthesized by magnetic self-assembly

Cited by 13 publications

References 30 publications

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets

Phase- and Composition-Tunable Hard/Soft Magnetic Nanofibers for High-Performance Permanent Magnet

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

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Magnetic properties of exchange coupled SmCo5/FeCo composite particles synthesized by magnetic self-assembly

Cited by 13 publications

References 30 publications

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm2Co17/FeCo Core–Shell Nanomagnets

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm2Co17/FeCo Core–Shell Nanomagnets

Phase- and Composition-Tunable Hard/Soft Magnetic Nanofibers for High-Performance Permanent Magnet

Study on the Microstructure and Magnetic Properties of Nd-Fe-B/Fe-Co Composite Nanowires

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Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core–Shell Nanomagnets