Effects of Intergranular Phase and Structure Defect on the Coercivity for the HDDR Nd-Fe-B Bonded Magnet
Year: 2012
Author: Min Liu, Xiao-Chen Jin, Ru-Wei Gao
Journal of Atomic and Molecular Sciences, Vol. 3 (2012), Iss. 3 : pp. 218–226
Abstract
Based on the specific microstructure of HDDR (hydrogenation, disproportionation, desorption, recombination) grains, that the bivariate model concerning the anisotropy constant K′1 and exchange integral A′1 in defect region, which was put forward. Subsequently, the dependence of magnet coercivity on the intergranular phase thickness d and structure defect thickness r0 was studied. The results showed that the coercivity, Hc, increases with increasing d, for the r0, the anisotropy constant K1(0) and exchange integral constant A1(0) at the grain surface taking different values. While K1(0) and A1(0) are fixed, Hc enhances with increasing r0 for the same d. On the contrary, for the fixed r0 and d, Hc decreases with increasing K1(0) or A1(0). The calculated coercivity is in good agreement with experimental results given by others when d takes 1 nm, r0 is in the rang of 2-5 nm, A1(0) and K1(0) change in the range of (0.6-0.7) of A1 and K1, respectively.
You do not have full access to this article.
Already a Subscriber? Sign in as an individual or via your institution
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jams.053111.071211a
Journal of Atomic and Molecular Sciences, Vol. 3 (2012), Iss. 3 : pp. 218–226
Published online: 2012-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 9
Keywords: bonded magnet bivariate model microstructure coercivity.