Magnetization reversal due to vortex nucleation, displacement, and annihilation in submicron ferromagnetic dot arrays
Magnetization reversal due to vortex nucleation, displacement, and annihilation in submicron ferromagnetic dot arrays
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DOI：
10.1103/physrevb.65.024414
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发表时间：
2002-01-01
影响因子：
3.7
通讯作者：
Fukamichi, K
中科院分区：
文献类型：
--
作者：
Guslienko, KY;Novosad, V;Fukamichi, K
解析地描述了亚微米尺度的软铁磁性多晶圆点阵列的磁化过程，其中磁化反转伴随着磁涡的成核、位移和湮灭。分析中考虑了静磁、交换和塞曼能量。每个点在外加磁场中的磁状态被视为偏心的刚性涡旋结构，即涡旋在位移的同时保持其自旋分布。这种刚性涡旋模型给出了初始磁化率、涡核和湮灭场的解析表达式，当点间距小于圆盘半径时，点间静磁相互作用对磁化反转起重要作用，此时初始磁化率增大，成核场和湮灭场都减小。将解析预测与微磁计算进行了比较，并讨论了该模型的局限性。
Magnetization processes are analytically described for the arrays of soft ferromagnetic polycrystalline circular dots with submicron dimensions, wherein the magnetization reversal accompanied by nucleation, displacement, and annihilation of magnetic vortices. Magnetostatic, exchange, and Zeeman energies are taken into account for the analysis. The magnetic state of each dot in an applied magnetic field is treated as an off-centered rigid vortex structure; i.e., the vortex keeps its spin distribution while being displaced. This rigid vortex model yields analytical expressions for the size-dependent initial susceptibility, the vortex nucleation, and the annihilation fields, The interdot magnetostatic interaction plays an Important role in the magnetization reversal for the arrays when the interdot distance is smaller than the disk radius, where the initial susceptibility increases and both the nucleation and annihilation fields decrease. The analytical predictions are compared to the micromagnetic calculations, and limitations of the model are discussed.