Magnetic properties of Sm-Fe-N bulk magnets produced from Cu-plated Sm-Fe-N powder

Saito, Tetsuji; Deguchi, Tomoe; Yamamoto, H.

doi:10.1063/1.4973396

Cited by 21 publications

(6 citation statements)

References 16 publications

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“…A short-term goal is to improve the theoretical prediction for the muon magnetic anomaly as a new generation of experiments are aiming at an increase in precision by a factor of four. 83,84 Assuming the expected improvement in the leading order hadronic vacuum polarisation part, and even if there is no improvement in the current uncertainty assigned to the light-by-light contribution, the discrepancy would reach about 8 standard deviations if measured at the same central value. This would represent a compelling signal for new physics beyond the Standard Model.…”

Section: Perspectivesmentioning

confidence: 99%

Hadron Contribution to Vacuum Polarisation

Davier¹,

Hoecker²,

Malaescu³

et al. 2016

Advanced Series on Directions in High Energy Physics

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Precision tests of the Standard Theory require theoretical predictions taking into account higher-order quantum corrections. Among these vacuum polarisation plays a predominant role. Vacuum polarisation originates from creation and annihilation of virtual particle-antiparticle states. Leptonic vacuum polarisation can be computed from quantum electrodynamics. Hadronic vacuum polarisation cannot because of the non-perturbative nature of QCD at low energy. The problem is remedied by establishing dispersion relations involving experimental data on the cross section for e + e − annihilation into hadrons. This chapter sets the theoretical and experimental scene and reviews the progress achieved in the last decades thanks to more precise and complete data sets. Among the various applications of hadronic vacuum polarisation calculations, two are emphasised: the contribution to the anomalous magnetic moment of the muon, and the running of the fine structure constant α to the Z mass scale. They are fundamental ingredients to high precision tests of the Standard Theory.

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Section: Perspectivesmentioning

confidence: 99%

Hadron Contribution to Vacuum Polarisation

Davier¹,

Hoecker²,

Malaescu³

et al. 2016

Advanced Series on Directions in High Energy Physics

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“…4. This convincingly demonstrated that a [37,38]. In addition, because the surface oxide film was not sufficiently controlled in these past studies, it cannot be said that the effect of addition was investigated accurately, under a condition of direct contact between Sm 2 Fe 17 N 3 and the additive element.…”

mentioning

confidence: 87%

Novel powder processing technologies for production of rare-earth permanent magnets

Takagi

Hirayama

Okada

et al. 2021

Science and Technology of Advanced Materials

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“…70 The powders are used in either injection molded or compression bonded magnets. Several lowtemperature powder consolidation techniques have been attempted with Sm-Fe-N. [71][72][73] Daido Electronics used melt-spinning method to obtain Sm-Fe flakes and then heat treated the flakes with nitrogen to obtain Sm-Fe-N powders. These powders were used to produce a range of magnet grades with injection molding and compression bonding method.…”

Section: Sm-fe-nmentioning

confidence: 99%

Manufacturing Processes for Permanent Magnets: Part I—Sintering and Casting

Cui

Ormerod²,

Parker

et al. 2022

JOM

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Permanent magnets (PMs) produce magnetic fields and maintain the field even in the presence of an opposing magnetic field. Electrical machines using permanent magnets are more efficient than those without. Currently, all known strong magnets contain rare earth (RE) elements, and they are core components of a wide range of applications including electric vehicles and wind turbines. RE elements such as Nd and Dy have become critical materials due to the growing demand and constrained supply. Improving the manufacturing process is effective in mitigating the RE criticality issue by reducing waste and improving parts consistency. In this article, the state of the industry for PM is reviewed in detail considering both the technical and economic drivers. The importance of RE elements is discussed along with their economic importance to green energy. The conventional sintering and casting manufacturing processes for commercial magnets, including Nd-Fe-B, Sm-Co, Alnico, and ferrite, are described in detail.

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Magnetic properties of Sm-Fe-N bulk magnets produced from Cu-plated Sm-Fe-N powder

Cited by 21 publications

References 16 publications

Hadron Contribution to Vacuum Polarisation

Hadron Contribution to Vacuum Polarisation

Novel powder processing technologies for production of rare-earth permanent magnets

Manufacturing Processes for Permanent Magnets: Part I—Sintering and Casting

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