Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires,Physical Review Research

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Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires
Physical Review Research ( IF 3.5 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevresearch.3.033085
I. M. Andersen ₁ , D. Wolf ₂ , L. A. Rodriguez _{3,

4} , A. Lubk ₂ , D. Oliveros ₁ , C. Bran ₅ , T. Niermann ₆ , U. K. Rößler ₂ , M. Vazquez ₅ , C. Gatel ₁ , E. Snoeck ₁

Affiliation

Cylindrical magnetic nanowires with large transversal magnetocrystalline anisotropy have been shown to sustain nontrivial magnetic configurations resulting from the interplay of spatial confinement, exchange, and anisotropies. Exploiting these peculiar three-dimensional (3D) spin configurations and their solitonic inhomogeneities is expected to improve magnetization switching in future spintronics, such as power-saving magnetic memory and logic applications. Here we employ holographic vector-field electron tomography to reconstruct the remanent magnetic states in CoNi nanowires with 10 nm resolution in 3D, with a particular focus on domain walls between remanent states and ubiquitous real-structure effects stemming from irregular morphology and anisotropy variations. By tuning the applied magnetic field direction, both longitudinal and transverse multivortex states of different chiralities and peculiar 3D features such as shifted vortex cores are stabilized. The chiral domain wall between the longitudinal vortices of opposite chiralities exhibits a complex 3D shape characterized by a push out of the central vortex line and a gain in exchange and anisotropy energy. A similar complex 3D texture, including bent vortex lines, forms at the domain boundary between transverse-vortex states and longitudinal configurations. Micromagnetic simulations allow an understanding of the origin of the observed complex magnetic states.

中文翻译：

钴镍纳米线中场可调的三维磁性纳米结构

具有大的横向磁晶各向异性的圆柱形磁性纳米线已被证明可以维持由空间限制、交换和各向异性相互作用产生的非平凡磁性配置。利用这些独特的三维 (3D) 自旋配置及其孤子不均匀性，有望改善未来自旋电子学中的磁化转换，例如节能磁存储器和逻辑应用。在这里，我们采用全息矢量场电子断层扫描技术以 10 nm 分辨率在 3D 中重建 CoNi 纳米线中的剩磁态，特别关注剩磁态之间的畴壁以及源自不规则形态和各向异性变化的无处不在的真实结构效应。通过调整外加磁场方向，不同手性的纵向和横向多涡旋状态和特殊的 3D 特征（例如移动的涡旋核心）都得到了稳定。相对手性的纵向涡流之间的手性畴壁表现出复杂的 3D 形状，其特征是中心涡旋线的推出以及交换和各向异性能量的增益。在横向涡旋状态和纵向配置之间的域边界处形成类似的复杂 3D 纹理，包括弯曲的涡旋线。微磁模拟允许了解观察到的复杂磁态的起源。相对手性的纵向涡流之间的手性畴壁表现出复杂的 3D 形状，其特征是中心涡旋线的推出以及交换和各向异性能量的增益。在横向涡旋状态和纵向配置之间的域边界处形成类似的复杂 3D 纹理，包括弯曲的涡旋线。微磁模拟允许了解观察到的复杂磁态的起源。相对手性的纵向涡流之间的手性畴壁表现出复杂的 3D 形状，其特征是中心涡旋线的推出以及交换和各向异性能量的增益。在横向涡旋状态和纵向配置之间的域边界处形成类似的复杂 3D 纹理，包括弯曲的涡旋线。微磁模拟允许了解观察到的复杂磁态的起源。

更新日期：2021-07-23

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