Fernandez-Roldan Jose A, Bran Cristina, Asenjo Agustina, Vázquez Manuel, Sorrentino Andrea, Ferrer Salvador, Chubykalo-Fesenko Oksana, Del Real Rafael P
Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany.
Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain.
Nanoscale. 2022 Sep 29;14(37):13661-13666. doi: 10.1039/d2nr03228g.
The spatial magnetization texture of a cylindrical nanowire has been determined by Transmission X-ray Microscopy (TXM) and X-ray magnetic circular dichroism (XMCD). For this purpose, nanowires with designed geometry, consisting of CoNi/Ni periodic segments, have been grown by designed electrodeposition into alumina templates. Experimental data allow one to conclude the presence of mono- and trivortex magnetic domains in CoNi segments but, unusually, these states are characterized by an asymmetric XMCD contrast across the nanowire's section. Micromagnetic modelling shows non-trivial three-dimensional structures with ellipsoidal vortex cores and non-axially symmetric magnetization along the nanowire direction. The modelled TXM contrast of micromagnetic structures allows to correlate the experimental asymmetric XMCD contrast to the easy axis direction of the uniaxial magnetocrystalline anisotropy.
通过透射X射线显微镜（TXM）和X射线磁圆二色性（XMCD）确定了圆柱形纳米线的空间磁化纹理。为此，通过设计电沉积将由CoNi/Ni周期性段组成的具有设计几何形状的纳米线生长到氧化铝模板中。实验数据使人们能够得出CoNi段中存在单涡旋和三涡旋磁畴的结论，但不同寻常的是，这些状态的特征是纳米线截面的XMCD对比度不对称。微磁学建模显示了具有椭圆形涡旋核和沿纳米线方向非轴对称磁化的非平凡三维结构。微磁结构的模拟TXM对比度允许将实验性不对称XMCD对比度与单轴磁晶各向异性的易轴方向相关联。
