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Temperature-dependent magnetic second-harmonic generation from Fe nanostructures grown on vicinal W(110)

机译：在邻近的W（110）上生长的铁纳米结构产生的温度依赖性磁二次谐波

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摘要

Temperature-dependent magnetic second-harmonic generation (MSHG) at normal incidence (NI) is used to determine magnetization curves from Au-capped ultrathin Fe nanostructures grown on a vicinal W( 110) substrate. Aligned magnetic nanostructures grown on low-symmetry interfaces are generally inhomogeneous, with different magnetic species, such as terrace and step atoms, contributing to the overall magnetic response from the interfacial regions. A phenomenological model of NI MSHG intensity and contrast at magnetic interfaces of 1 m symmetry is used to extract the magnetization information. Two characteristic temperatures are identified for both 0.75 and 2.0 monolayers of Fe, and it is proposed that the increased sensitivity of SHG to step atoms, compared to linear optical techniques, allows the contribution of boundary atoms to the spin block response to be directly detected at lower temperatures. The behavior of boundary spins such as these is expected to be important for atomic-scale magnetic structures.
机译：使用法向入射（NI）随温度变化的磁二次谐波（MSHG）来确定在邻近W（110）衬底上生长的Au封端的超薄铁纳米结构的磁化曲线。在低对称界面上生长的对齐磁性纳米结构通常是不均匀的，具有不同的磁性物种，例如阶跃原子和阶梯原子，有助于界面区域的整体磁响应。使用NI MSHG强度和对称性为1 m的磁性界面上的对比度的现象学模型来提取磁化信息。 Fe的0.75和2.0单层都有两个特征温度，并且建议与线性光学技术相比，SHG对阶梯原子的敏感性增加，可以直接检测到边界原子对自旋嵌段响应的贡献。较低的温度。诸如此类的边界自旋的行为预期对于原子级磁性结构很重要。

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