Textured Nd2Fe14B flakes with enhanced coercivity

被引：21

作者：

Cui, B. Z. ^{[1
]}

Zheng, L. Y. ^{[2
]}

Marinescu, M. ^{[1
]}

Liu, J. F. ^{[1
]}

Hadjipanayis, G. C. ^{[2
]}

机构：

[1] Electron Energy Corp, Landisville, PA 17538 USA

[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

关键词：

This work was supported by the DOE ARPA-E and the NSF (Funding No. IIP-1026786);

D O I：

10.1063/1.3679425

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Morphology, structure, and magnetic properties of the [001] textured Nd2Fe14B nanocrystalline flakes prepared by surfactant-assisted high energy ball milling (HEBM) and subsequent annealing were studied. These flakes have a thickness of 80-200 nm, a length of 0.5-10 mu m, and an average grain size of 10-14nm. The addition of some amount of Dy, Nd70Cu30 alloy, and an appropriate post annealing increased the coercivity H-i(c) of the Nd2Fe14B flakes. iHc was 3.7, 4.3, and 5.7 kOe for the Nd15.5Fe78.5B6, Nd14Dy1.5Fe78.5B6 and 83.3wt.% Nd14Dy1.5Fe78.5B6+16.7 wt.% Nd70Cu30 flakes prepared by HEBM for 5 h in heptane with 20 wt.% oleylamine, respectively. After annealing at 450 degrees C for 0.5h, their iHc increased to 5.1, 6.2, and 7.0 kOe, respectively. Anisotropic magnetic behavior was found in all of the as-milled and annealed flakes. Both, the thickening of Nd-rich phase at grain boundaries via diffusion of Nd70Cu30 and the surface modification of the Nd2Fe14B flake could be the main reasons for the coercivity enhancement in the as-milled and annealed Nd70Cu30-added Nd2Fe14B flakes. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3679425]

引用

页数：3

共 8 条

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