钴镍纳米线中磁场可调的三维磁性纳米织构
Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires
摘要：
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、交换和各向异性的相互作用引起的非平凡的磁性配置。利用这些特殊的三维自旋配置和它们的孤子不均匀性，有望改善未来自旋电子学中的磁化开关，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重建的recrystalmagnetic状态在CoNi纳米线与10 nm的分辨率在3D中，特别关注recrystalmagnetic状态和无处不在的真实结构的影响源于不规则的形态和各向异性的变化之间的畴壁。通过调节施加的磁场方向，不同手征性的纵向和横向多涡旋状态以及诸如移位的涡旋核的独特的3D特征都被稳定。相反的手征性的纵向涡之间的手征域壁表现出复杂的三维形状，其特征在于推出的中心涡线和增益的交换和各向异性能量。一个类似的复杂的三维纹理，包括弯曲的涡线，形成在横向涡状态和纵向配置之间的域边界。微磁模拟可以理解所观察到的复杂磁状态的起源。
英文摘要：
Cylindrical magnetic nanowires with large transversal magnetocrystalline anisotropy have been shown to sustain non-trivial magnetic configurations resulting from the interplay of spatial confinement, exchange, and anisotropies. Exploiting these peculiar 3D spin configurations and their solitonic inhomogeneities are prospected 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 multi-vortex 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.
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