Enhancement of coercivity for Nd-Fe-B thin films by the infiltration of Nd-Cu alloy cap layer

被引：21
|
作者：
Sato, T. [2 ]
Oka, N. [1 ]
Ohsuna, T. [2 ]
Kaneko, Y. [2 ]
Suzuki, S. [1 ]
Shima, T. [1 ]
机构：
[1] Tohoku Gakuin Univ, Fac Engn, Tagajo, Miyagi 9858537, Japan
[2] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2011年 / 110卷 / 02期
关键词：
PERMANENT-MAGNETS;
D O I：
10.1063/1.3608244
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In order to understand the mechanism of coercivity (H-c) of Nd-Fe-B magnets, we have investigated the effect of thermal annealing treatment on Nd-Fe-B thin films with Nd-Cu alloy cap layers. A substantial enhancement of H-c from 19.0 kOe (1512 kAm(-1)) to 26.1 kOe (2078 kAm(-1)) was obtained for the Nd-Fe-B/Nd36Cu64 films after post-annealing at 400 degrees C. Through electron microscope observation, it was revealed that Nd and Cu enrichment is clearly observed in the grain boundary of the Nd-Fe-B layer, whereas the concentration of Fe was decreased there. These results suggest that the exchange coupling between Nd2Fe14B grains is weakened by the infiltration of a non-magnetic element into the grain boundary after the optimum thermal annealing treatment. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3608244]
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页数：4
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