Enhancing the perpendicular anisotropy of NdDyFeB films by Dy diffusion process

Gong, Wenyu; Wang, X.; Liu, W.; Guo, Sheng Min; Wang, Z. H.; Cui, Wei; Zhu, Yan; Zhang, Y. Q.; Zhang, Z. D.

doi:10.1063/1.3679074

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…The field dependence of the coercivity in Fig. 3(a) obtained from the minor hysteresis loops shows that the coercivity increases fast with the applied field, which confirms the nucleation coercivity mechanism as well [18].…”

Section: Coercivity Mechanismsupporting

confidence: 63%

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

et al. 2015

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The microstructure, magnetic properties and coercivity mechanism of rapidly quenched rare-earth-free L1 0 -Mn 1.86 Ga and D0 22 -Mn 3 Ga permanent magnetic ribbons have been investigated. The high remanence M r of 61.3 emu/g and maximum energy product of 2.1 MGOe are obtained in L1 0 -Mn 1.86 Ga ribbons. The coercivity H C of L1 0 -Mn 1.86 Ga and D0 22 -Mn 3 Ga are 2.7 and 6.9 kOe, respectively. The different coercivity mechanism and exchange coupling behaviour have been discussed, upon the measurement of minor loops and Henkel plots. The minor second phase at grain boundaries in L1 0 -Mn 1.86 Ga ribbons may act as pinning center of domain wall, thus reduce the exchange coupling. Both ribbons with Curie temperature above 700 K may be promising permanent magnets at room temperature.

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Section: Coercivity Mechanismsupporting

confidence: 63%

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

et al. 2015

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“…An obvious boundary is observed between the main phase and the grain boundary phase in the S2 sample. The Fe element shows the distribution of RE 2 Fe 14 B grains [ 24 ]. Therefore, from the element distribution, it is concluded that Y enters the 2:14:1 main phase.…”

Section: Resultsmentioning

confidence: 99%

Coercivity Mechanism and Magnetization Reversal in Anisotropic Ce-(Y)-Pr-Fe-B Films

Zhao

Liu

et al. 2021

Materials

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In this study, the magnetic properties, coercivity mechanism, and magnetization reversal process were investigated for Ce-(Y)-Pr-Fe-B films. After the addition of Y and subsequent heating treatment, the formations of REO (RE ≡ Ce and Pr) and REFe2 (RE ≡ rare earths) phases are inhibited, and the microstructure of Ce-Y-Pr-Fe-B film is optimized. Meanwhile, the coercivity and the squareness of the hysteresis loop are significantly improved. The coercivity mechanism of Ce-Y-Pr-Fe-B film is determined to be a mixture of nucleation and pinning mechanisms, but dominated by the nucleation mechanism. The demagnetization results show that the nucleation of reversal magnetic domains leads to irreversible reversal. Our results are helpful to understand the coercivity mechanism and magnetization reversal of permanent magnetic films with multi-main phases.

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“…From a technical point of view, the Nd 2 Fe 14 B compound is congenitally deficient for operation at high temperatures because of its low Curie temperature (∼300 • C) and relatively low magnetocrystalline anisotropy. To compensate the strong temperature dependence of the coercivity of Nd 2 Fe 14 B-based magnets, a significant amount of heavy rare earths have to be added in order to use the magnets at temperatures above 100 • C [15,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. The gain from this doping becomes extraordinarily expensive: it makes Dy and Tb the most critical elements with very high and fluctuating market price for their unreliable supply [35].…”

Section: A Brief Historymentioning

confidence: 99%

Advances in nanostructured permanent magnets research

Poudyal¹,

Liu²

2012

J. Phys. D: Appl. Phys.

240

140

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This paper reviews recent developments in research in nanostructured permanent magnets (hard magnetic materials) with emphasis on bottom-up approaches to fabrication of hard/soft nanocomposite bulk magnets. Theoretical and experimental findings on the effects of soft phase and interface conditions on interphase exchange interactions are given. Synthesis techniques for hard magnetic nanoparticles, including chemical solution methods, surfactant-assisted ball milling and other physical deposition methods are reviewed. Processing and magnetic properties of warm compacted and plastically deformed bulk magnets with nanocrystalline morphology are discussed. Prospects of producing bulk anisotropic hard/soft nanocomposite magnets are presented.

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Enhancing the perpendicular anisotropy of NdDyFeB films by Dy diffusion process

Cited by 14 publications

References 16 publications

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

Structure, Magnetic Properties, and Coercivity Mechanism of Rapidly Quenched Mn<sub><italic>x</italic></sub>Ga Ribbons

Coercivity Mechanism and Magnetization Reversal in Anisotropic Ce-(Y)-Pr-Fe-B Films

Advances in nanostructured permanent magnets research

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