Domain wall propagation tuning in magnetic nanowires through geometric modulation
Domain wall propagation tuning in magnetic nanowires through geometric modulation
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DOI：
10.1016/j.jmmm.2017.01.071
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发表时间：
2017-06-15
影响因子：
2.7
通讯作者：
Pirota, K. R.
中科院分区：
文献类型：
--
作者：
Arzuza, L. C. C.;Lopez-Ruiz, R.;Pirota, K. R.
研究了嵌入多孔氧化铝膜中的镍调制纳米线的磁性行为。它们的直径在横向和涡旋畴壁的理论极限以下（35 nm）和以上（52 nm）之间表现出急剧的过渡。在具有不同宽窄段长度比的几个有序纳米线阵列上测量了磁滞回线和一阶反转曲线（FORC），并与同质纳米线的磁滞回线和一阶反转曲线（FORC）进行了比较。实验磁响应证明了具有调制直径的纳米线的相当复杂的磁化率行为。对孤立的第一邻居纳米线阵列的微磁模拟表明，取决于段直径的畴壁结构在穿过直径调制时会发生转变，但没有任何钉扎。实验阵列磁行为可归因于直径调制引起的异质杂散场，在宽端产生比窄端更强的相互作用场。结果证明了通过调制磁性实体的横向来控制畴壁传播和形态的可能性。 (C) 2017 Elsevier B.V. 保留所有权利。
The magnetic behavior of nickel modulated nanowires embedded in porous alumina membranes is investigated. Their diameters exhibit a sharp transition between below (35 nm) and above (52 nm) the theoretical limit for transverse and vortex domain walls. Magnetic hysteresis loops and first-order reversal curves (FORCs) were measured on several ordered nanowire arrays with different wide-narrow segment lengths ratio and compared with those from homogenous nanowires. The experimental magnetic response evidences a rather complex susceptibility behavior for nanowires with modulated diameter. Micromagnetic simulations on isolated and first-neighbors arrays of nanowires show that the domain wall structure, which depends on the segment diameter, suffers a transformation while crossing the diameter modulation, but without any pinning. The experimental array magnetic behavior can be ascribed to a heterogeneous stray field induced by the diameter modulation, yielding a stronger interaction field at the wide extremity than at the narrow one. The results evidence the possibility to control the domain wall propagation and morphology by modulating the lateral aspect of the magnetic entity. (C) 2017 Elsevier B.V. All rights reserved.