Huang Hai, Lee Sang-Jun, Kim Bongju, Sohn Byungmin, Kim Changyoung, Kao Chi-Chang, Lee Jun-Sik
Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea.
ACS Appl Mater Interfaces. 2020 Aug 19;12(33):37757-37763. doi: 10.1021/acsami.0c10545. Epub 2020 Aug 4.
SrRuO (SRO) thin films and their heterostructure have attracted much attention because of the recently demonstrated fascinating properties, such as topological Hall effect and skyrmions. Critical to the understanding of those SRO properties is the study of the spin configuration. Here, we conduct resonant soft X-ray scattering (RSXS) at the oxygen K edge to investigate the spin configuration of a four-unit-cell SRO film that was grown epitaxially on a single-crystal SrTiO. The RSXS signal under a magnetic field (∼0.4 tesla) clearly shows a magnetic dichroism pattern around the specular reflection. Model calculations on the RSXS signal demonstrate that the magnetic dichroism pattern originates from a Néel-type chiral spin structure in this SRO thin film. We believe that the observed spin structure of the SRO system is a critical piece of information for understanding its intriguing magnetic and transport properties.
SrRuO（SRO）薄膜及其异质结构因其最近展现出的迷人特性，如拓扑霍尔效应和斯格明子，而备受关注。理解这些SRO特性的关键在于对自旋构型的研究。在此，我们在氧K边进行共振软X射线散射（RSXS），以研究在单晶SrTiO上外延生长的四晶胞SRO薄膜的自旋构型。在磁场（约0.4特斯拉）下的RSXS信号清楚地显示出镜面反射周围的磁二向色性图案。对RSXS信号的模型计算表明，磁二向色性图案源自该SRO薄膜中的奈尔型手性自旋结构。我们认为，所观察到的SRO系统的自旋结构是理解其有趣的磁性和输运特性的关键信息。
