%A Chen Xian-Feng
%T Effect of the second-order magnetocrystalline anisotropic constant on the magnetization reversal in R_{2}Fe_{14}B magnets
%0 Journal Article
%D 2005
%J Acta Physica Sinica
%R 10.7498/aps.54.3856
%P 3856
%V 54
%N 8
%U {http://wulixb.iphy.ac.cn/CN/abstract/article_10924.shtml}
%8 2005-08-20
%X In this work, the dependence of the second-order magnetocrystalline anisotropic constant K_{2} on the minimum nucleation field H^{min}_{n has been investigated by the numerical method and the analytical formulation under the second-order approximation. It is found that the contribution of K2 t o H minn is very large at low temperatures for isotropic Pr2}Fe_{14}B magnets. Although the value of H^{min}_{n for Nd2Fe14B can b e obt ained using the analytical formulation under the first-order approximation, the value of Hminn for Pr2Fe14B is achie ved using the formulation under the second-order approxiamtion. Using the obtained value of Hminn, a good linear relation between coercivity and Hminn}~~ is found in the temperature range from 20 K to room temperature.~~