Effects of crystallization conditions on magnetic properties of crystallized Nd-Fe-B ribbons.

博俊, 福永; 慶太, 井原; 賢仁, 成田

doi:10.3379/jmsjmag.10.229

Cited by 3 publications

(1 citation statement)

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“…7,8 In both of these methods, the heavy rare-earth element is diffused by annealing at high temperatures of over 1000 K. A low-temperature process is required for isotropic magnets that are fabricated by crystallizing an amorphous powder because hightemperature annealing causes Nd 2 Fe 14 B grains to grow, which degrades the magnetic properties of isotropic magnet powders. 9 In this study, we developed a low-temperature method for diffusing Dy into isotropic Nd-Fe-B crystalline flakes, thereby enhancing their coercivity.…”

Section: Introductionmentioning

confidence: 99%

Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization

Fukunaga

Sugimoto

Nakano

et al. 2011

Journal of Applied Physics

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The coercivity of isotropic Dy-coated Nd-Fe-B flakes was enhanced by crystallization and simultaneous diffusion of Dy from their surfaces. Amorphous Dy-coated Nd-Fe-B flakes were crystallized by heating them to 923 K 2over a 2 min period followed by rapid cooling. During crystallization, the Dy on the surface diffused into the flakes. This low-temperature rapid annealing produced flakes with fine grains and the Dy diffusion enhanced their coercivity. The coercivity after crystallization increased with increasing Dy layer thickness, although the remanence decreased when the layer thickness exceeded 3 lm. Thick coatings of over 6 lm resulted in the formation of DyFe 2 , which degraded the magnetic properties of the crystallized flakes. Flakes with a 3-lm-thick coating exhibited excellent magnetic properties after annealing: They had a coercivity of 1880 kA/m and a remanence of 78 emu/g. This coercivity is approximately 500 kA/m higher than that of uncoated flakes, whereas the remanence is comparable to that of uncoated flakes.

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Section: Introductionmentioning

confidence: 99%

Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization

Fukunaga

Sugimoto

Nakano

et al. 2011

Journal of Applied Physics

Self Cite

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Magnetic Properties of Rapidly Quenched Nd₁₀Fe_85-xT_xB₅ (T=Zr, Nb) Alloys

Kohmoto

Yoneyama

Yajima

1987

Jpn. J. Appl. Phys.

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We propose some improvements in the form of the eikonal wavefunction and a more rigorous evaluation of the integral for the DWBA amplitude for electron-nucleus scattering as given by Yennie. Our calculations are found to be in closer agreement with the phase-shift results than those of Yennie er al (for e'-Au scattering) and Rosenfelder (for e--Pb scattering based on the eikonal approximation of the T matrix). The improved eikonal method is applied to the study of the isotopic effect in e--Ti scattering. The effect of the addition of a small oscillatory part to the smoothly varying nuclear charge distribution for e--32S scattering at high momentum transfer is also investigated with the help of our eikonal method.

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