Magnetization Reversal of Nickel Three-Dimensional Anti-sphere Arrays
Magnetization Reversal of Nickel Three-Dimensional Anti-sphere Arrays
复制标题
镍三维反球体阵列的磁化反转
DOI：
10.1109/lmag.2016.2616325
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发表时间：
2016
影响因子：
1.2
通讯作者：
Han, Ping
中科院分区：
文献类型：
--
作者：
Yu, Le;Yan, Z.Y.;Yang, H.C.;Chai, X.Z.;Li, B.Q.;Moeendarbari, Sina;Hao, Y.W.;Zhang, Di;Feng, Gang;Han, Ping
镍的三维反球阵列（3DAA）已被制造使用电化学沉积到自组装聚苯乙烯球模板，这提供了直接的可扩展性的优点。使用一阶反转曲线（FORC）的方法，磁反转机制的FORC分布中的特征识别。在最薄的样品中观察到一个左弯曲的回飞镖状特征，随着样品厚度的增加，该特征转变为沿着局部磁化率Hcaxis取向的脊。这种转变确定了从交换占主导地位的畴生长反转到局部弱相互作用粒子状反转的反转过程中的变化。微磁学模拟证实了随着Ni 3DAA结构厚度的增加，磁畴生长减少，钉扎行为增加，为FORC分析和解释提供了有力的支持。
Three-dimensional antisphere arrays (3DAAs) of Ni have been fabricated using electrochemical deposition into self-assembled polystyrene sphere templates, which offers the advantage of straightforward scalability. Using the first-order reversal curve (FORC) method, the magnetic reversal mechanism is identified from the characteristic features in the FORC distribution. A left-bending boomerang-like feature is observed in the thinnest sample, which transforms to a ridge oriented along the local coercivity Hcaxis with increasing sample thickness. This transformation identifies a change in the reversal process from an exchange dominated domain-growth reversal to a localized weakly interacting particle-like reversal. Micromagnetic simulations confirm the decrease in domain growth and increase of pinning behaviors as the thickness of the Ni 3DAAs structure increases, providing strong support to the FORC analysis and interpretation.