Nonlinear conjugate gradient methods in micromagnetics
Nonlinear conjugate gradient methods in micromagnetics
复制标题
DOI：
10.1063/1.4981902
复制
发表时间：
2017-04-01
期刊：
影响因子：
1.6
通讯作者：
Manabe, A.
中科院分区：
文献类型：
--
作者：
Fischbacher, J.;Kovacs, Alexander;Manabe, A.
比较了微磁学中能量最小化的共轭梯度法。解析结果与数值模拟结果的比较表明，标准共轭梯度法可能得不到正确的结果。为了避免这一问题，提出了一种限制线搜索步长的方法。当控制线搜索的步长时，共轭梯度法是计算永磁体磁滞特性的一种快速可靠的方法。将该方法应用于NdFe_（12）基永磁体的退磁研究。在450 K时，退磁效应对矫顽场的影响为μ（0）Δ H = 1.4 T。(C)2017年作者。除非另有说明，否则所有文章内容均根据知识共享署名（CC BY）许可证（http：//creativecommons.org/licenses/by/4.0/）进行许可。
Conjugate gradient methods for energy minimization in micromagnetics are compared. The comparison of analytic results with numerical simulation shows that standard conjugate gradient method may fail to produce correct results. A method that restricts the step length in the line search is introduced, in order to avoid this problem. When the step length in the line search is controlled, conjugate gradient techniques are a fast and reliable way to compute the hysteresis properties of permanent magnets. The method is applied to investigate demagnetizing effects in NdFe12 based permanent magnets. The reduction of the coercive field by demagnetizing effects is mu(0)Delta H = 1.4 T at 450 K. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).