Metlov Konstantin L, Michels Andreas
Donetsk Institute for Physics and Technology, Donetsk, 83114, Ukraine.
University of Luxembourg, Physics and Materials Science Research Unit, Luxembourg, L-1511, Grand Duchy of Luxembourg.
Sci Rep. 2016 Apr 26;6:25055. doi: 10.1038/srep25055.
Using analytical expressions for the magnetization textures of thin submicron-sized magnetic cylinders in vortex state, we derive closed-form algebraic expressions for the ensuing small-angle neutron scattering (SANS) cross sections. Specifically, for the perpendicular and parallel scattering geometries, we have computed the cross sections for the case of small vortex-center displacements without formation of magnetic charges on the side faces of the cylinder. The results represent a significant qualitative and quantitative step forward in SANS-data analysis on isolated magnetic nanoparticle systems, which are commonly assumed to be homogeneously or stepwise-homogeneously magnetized. We suggest a way to extract the fine details of the magnetic vortex structure during the magnetization process from the SANS measurements in order to help resolving the long-standing question of the magnetic vortex displacement mode.
利用涡旋态下亚微米级细磁柱磁化纹理的解析表达式，我们推导出了随之产生的小角中子散射（SANS）截面的闭式代数表达式。具体而言，对于垂直和平行散射几何结构，我们计算了在圆柱侧面不形成磁荷的情况下，涡旋中心小位移时的截面。这些结果代表了在孤立磁性纳米粒子系统的SANS数据分析方面在定性和定量上的重大进展，这些系统通常被假定为均匀磁化或逐步均匀磁化。我们提出了一种从SANS测量中提取磁化过程中磁涡旋结构精细细节的方法，以帮助解决磁涡旋位移模式这个长期存在的问题。
