Geometric effects in cylindrical core/shell hard–soft exchange-coupled magnetic nanostructures

Kim, Nam-Kyu; Han, Hee‐Sung; Lee, Sooseok; Kim, Minji; Jung, Dong‐Won; Kang, Myeonghawn; Ok, Hye-Jin; Son, Youngkyun; Lee, Sukbin; Lee, Ki-Suk

doi:10.1016/j.jmmm.2020.167599

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Firstly, BH max is the highest value of the energy products among various magnitudes of the magnetic field. The energy products obtained from the magnetic hysteresis of a magnet loop can supply the expectation value of the energy product of magnets for different shapes, although it does not perfectly match the energy product of the magnets [5,6]. The only meaningful value for a system is an energy product at the remanent state, which is determined from the demagnetizing field by the shape of the magnet.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Three-dimensional Energy Product for Isotropic Nd2Fe14B Magnet

et al. 2022

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A conventional energy product calculated by the product of the B-field and the H-field is not sufficient for representing the performance of a magnet because it considers the homogeneous and only the uniaxial magnetic properties of the magnet. The conventional energy product has been compared with another energy product obtained by integrating the scalar product of the B-field and the H-field of each cell composed of the three-dimensional components. We investigated a model system by micromagnetic simulation using finite differential method (FDM) and calculated the full hysteresis of the magnet. The model system of a Nd2Fe14B magnet composed of grains with a diameter of about 100 nm was assumed. In the case of the isotropic multi-grain magnet, the energy product calculated by the integration method was 28% larger than the energy product obtained by the conventional way, although a discrepancy between the distribution of the magnetizations and the demagnetizing fields at the reversal process resulted in the decrease of the energy product.

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Section: Introductionmentioning

confidence: 99%

Calculation of Three-dimensional Energy Product for Isotropic Nd2Fe14B Magnet

et al. 2022

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Closed-Loop Analysis of Nanocomposite Magnets: Integrating Micromagnetic Simulation and Experimental Testing

Xu,

2024

Journal of Magnetism and Magnetic Materials

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Maximum energy product of exchange-coupled Sm(FeCo)12/α-Fe nanocomposite particle

et al. 2023

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The effects of the coating surface orientation of the α-Fe soft magnetic layer on the Sm(Fe0.8Co0.2)12 hard magnetic phase and the volume fraction of α-Fe, VFe, on the maximum energy product, ( BH)max of exchange-coupled Sm(Fe0.8Co0.2)12/α-Fe nanocomposite magnet particles were micromagnetics OOMMF package was systematically investigated. The ( BH)max of the reference model, Sm(Fe0.8Co0.2)12 particles without Fe layer, was 630 kJ/m3. In contrast, in the nanocomposite magnet particle model with soft magnetic layers on both sides of the hard magnetic phase, ( BH)max reached a maximum value of 657 kJ/m3 at VFe = 12% (Fe layer thickness, tFe = 2 nm). In the model with α-Fe coating on the top and bottom surfaces of the hard magnetic phase, ( BH)max = 636 kJ/m3 at VFe = 4% ( tFe = 2 nm). Furthermore, the coating of the soft magnetic phase on both sides of the hard phase particles reduces the magnitude of the demagnetizing field, Hd of the nanocomposite magnet particles, indicating that the side coating of the soft magnetic phase is effective in increasing ( BH)max. These findings allow for a greater degree of freedom in the design of nanocomposite magnets by adjusting not only the VFe volume fraction of the hard/soft phases but also their arrangement.

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Geometric effects in cylindrical core/shell hard–soft exchange-coupled magnetic nanostructures

Cited by 5 publications

References 25 publications

Calculation of Three-dimensional Energy Product for Isotropic Nd2Fe14B Magnet

Calculation of Three-dimensional Energy Product for Isotropic Nd2Fe14B Magnet

Closed-Loop Analysis of Nanocomposite Magnets: Integrating Micromagnetic Simulation and Experimental Testing

Maximum energy product of exchange-coupled Sm(FeCo)12/α-Fe nanocomposite particle

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