Determination of interface layer effects on magnetic properties of nanocomposite magnets and exchange coupling between magnetic entities

Abbas, Nadeem; Wang, Fang; Ren, Hanyang; Liu, J. Ping; Xia, Weixing; Du, Juan; Zhao, Guoping; Zhang, Jian

doi:10.1016/j.apsusc.2019.02.191

Cited by 5 publications

(3 citation statements)

References 62 publications

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“…In the anisotropic hard/soft spring magnet with a fixed size of the soft phase, the strength of H c only has a positive correlation with the exchange-coupling effect between nanograins across the interface . Our results show a pronounced enhancement in H c within a hard/soft composition of 100:0 to 90:10 (vol %) based on the strong exchange-coupling interaction.…”

Section: Results and Discussionmentioning

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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Section: Results and Discussionmentioning

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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“…As for the variety of H C , it is affected by many factors such as soft phase content and interface exchange coupling, which is more complicated. Considering that the H C of the composites in the previous report has a certain positive correlation with the exchange coupling effect, we speculate that the reason why the Co/FeCo-1/2 composite maintains a high coercivity (2764.4 Oe) is that, on the one hand, due to the increase of the soft magnetic phase, the H C of all composites decreases slightly. On the other hand, due to the strong exchange coupling of the hard/soft magnetic phases, this brings the H C pick up.…”

Section: Resultsmentioning

confidence: 56%

Exchange-Coupling of Hard/Soft Magnetic Phases of Co/FeCo Nanocomposites

et al. 2022

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Co/FeCo nanocomposites with improved magnetic performances were successfully fabricated via a liquid-phase approach. Accordingly, cobalt nanoparticles were previously prepared as hard phases by the modified polyol method, then the FeCo was deposited on cobalt nanoparticles through an electroless plating process to construct exchange-coupled nanocomposites, with controlled hard/soft phase ratios. Magnetic measurements show that the Co/FeCo nanocomposite with an optimal mass ratio of 1/2 has significantly enhanced saturation magnetization (119.14 emu•g −1 ) and remanence, which is 21.9% higher than that of a single component. More, the unkinked hysteresis loop and single-phase magnetization behavior further prove the sufficient exchange coupling effect between hard and soft nanograins. This presents the great potential of this type of nanocomposite as high performance exchange-spring magnets.

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“…Rougher surfaces and possibly even fractal structures could be created by combining the Nanomaterials 2020, 10, 738 2 of 13 electrospinning technique with additional electrospraying used in this study [20], or by carbonization or calcination of polymer/magnetic nanoparticle nanofibers, prepared by electrospinning [21][22][23]. Such technologies may lead to even more interesting magnetization reversal processes, e.g., featuring a domain wall trapping due to surface notches [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic Simulations of Chaotic Ferromagnetic Nanofiber Networks

2020

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Electrospinning can be used to create nanofibers with diameters of typically a few tens to a few hundred nanometers. While pure polymers are often electrospun, it is also possible to use polymer blends or to include nanoparticles. In this way, e.g., magnetic nanofiber networks can be created with a certain diameter distribution, random fiber orientations, and random crossing positions and angles. Here we present for the first time micromagnetic simulations of small parts of stochastically oriented nanofiber networks. Magnetization reversal mechanisms are investigated for different local spatial distributions; mutual influences of neighboring magnetic fibers due to dipolar interactions are depicted. This study serves as a base for the possible use of such stochastic nanofiber networks in the research area of neuro-inspired materials.

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Determination of interface layer effects on magnetic properties of nanocomposite magnets and exchange coupling between magnetic entities

Cited by 5 publications

References 62 publications

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

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

Exchange-Coupling of Hard/Soft Magnetic Phases of Co/FeCo Nanocomposites

Micromagnetic Simulations of Chaotic Ferromagnetic Nanofiber Networks

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