Dependence of coercivity on the intergranular phase for nanocrystalline Nd–Fe–B magnet

Assume that the intergranular phase (IP) existing between adjacent grains is a weak magnetic phase, and could weaken or interrupt the intergrain exchange-coupling interaction (IECI). Using our proposed cubic-grain anisotropy model, we investigate the effects of IP's thickness d, and its anisotr...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-11, Vol.486 (1), p.257-260
Main Authors: Liu, M., Han, G.B., Yang, W., Gao, R.W.
Format: Article
Language:English
Subjects:
Anisotropy
Coercive force
Coercivity
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Exchange-coupling interaction
Fe and its alloys
Ferrous alloys
Intergranular phase
IP (Internet Protocol)
Magnetic materials
Magnetic properties and materials
Mathematical models
Nanocrystalline magnet
Nanocrystals
Physics
Small particles and nanoscale materials
Studies of specific magnetic materials
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Summary:Assume that the intergranular phase (IP) existing between adjacent grains is a weak magnetic phase, and could weaken or interrupt the intergrain exchange-coupling interaction (IECI). Using our proposed cubic-grain anisotropy model, we investigate the effects of IP's thickness d, and its anisotropy constant K 1(0) on the coercivity of nanocrystalline Nd–Fe–B magnet. Calculation results indicate that the coercivity increases with increasing d, but decreases with increasing K 1(0). When d = 1.2 nm and K 1(0) = 0.5 K 1 ( K 1 is the common anisotropy constant of the bulk Nd–Fe–B material), our calculated results are consistent with available experimental data.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2009.07.089