2012
DOI: 10.1063/1.3679074
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Enhancing the perpendicular anisotropy of NdDyFeB films by Dy diffusion process

Abstract: A large coercivity and anisotropy enhancement in perpendicular NdDyFeB (120 nm)/Dy (tDy) films has been realized by a Dy grain-boundary diffusion process. The coercivity HC and the ratio Mr/Ms reach their maxima at tDy = 50 nm, and the magnetic domain sizes increase with increasing tDy. The HC and Mr/Ms increasing with tDy is due to the enhancement of the anisotropy of (Nd,Dy)2Fe14B grains by Dy substitution for Nd. The coercivity mechanism is a nucleation-type mechanism. Dy and Nd elements coexist at grain bo… Show more

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Cited by 15 publications
(7 citation statements)
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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%
“…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%
“…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%
“…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%