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易轴取向对Nd2Fe14B/α-Fe双层膜退磁过程影响的微磁学分析
Micromagnetic analysis of the effect of the easy axis orientation on demagnetization process in Nd2Fe14B/α-Fe bilayers
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摘要: 运用一维和三维微磁学模拟探究了易轴与外场存在偏角β情况下Nd2Fe14B/α-Fe双层膜的磁矩反转过程，计算了磁矩反转过程中磁滞回线和磁能积，并与实验结果进行了对比.计算结果表明，在膜面内的易轴偏角β严重影响磁矩反转过程.当β=0?时，磁矩反转过程中无明显成核现象，随着易轴偏角β的增大，剩磁显著减小，磁滞回线方形度变差，导致磁能积急剧减小.对于Nd2Fe14B(10 nm)/α-Fe(8 nm)双层膜，β=10?时，最大磁能积下降30.3%.在磁矩反转过程中，总能量最大时对应的外磁场能随易轴偏角的增大而减小，交换作用能先增大后减小，磁晶各向异性能则随着易轴偏角的增大而增大.软磁相厚度越大，双层膜的磁能积受易轴偏角影响越大.在膜面外的易轴偏角对磁矩反转过程也有类似的影响.Abstract: The hysteresis loops and energy products in the magnetization reversal process are investigated by one-and three-dimensional micromagnetic methods for a Nd2Fe14B/α-Fe bilayer system with an angleβbetween the applied field and the easy axis, and the results are compared with available experimental results. The calculation shows that the deviation of the easy axis affects the magnetization reversal process seriously. When β=0?, there is no obvious nucleation in the magnetization reversal process. The remanence decreases asβdecreases, and the squareness of the hysteresis loops is weakened, leading to the sharp decrease of energy product. For Nd2Fe14B(10 nm)/α-Fe(8 nm), the energy product decreases by 30.3%whenβ=10?. In the magnetization reversal process, as the total energy reaches the maxium, Zeeman energy decreases with increasing ofβ, and the exchange energy first increases and then decreases slightly, and the anisotropic energy increases with the increasing ofβ. The deviation of easy axis has a greater influence on the energy product of the bilayer system with larger soft thickness. The out-of-plane deviation of easy axis has a similar effect.
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