Tailoring Noncollinear Magnetism By Misfit Dislocation Lines

Data for the publication: "The large epitaxial stress induced by the misfit between a triple atomic layer Fe film and an Ir(111) substrate<br> is relieved by the formation of a dense dislocation line network. Spin-polarized scanning tunneling microscopy<br> investigations show that the strain is locally varying within the Fe film and that this variation affects the magnetic<br> state of the system. Two types of dislocation line regions can be distinguished and both exhibit spin spirals<br> with strain-dependent periods (ranging from 3 to 10 nm). Using a simple micromagnetic model, we attribute the<br> changes of the period of the spin spirals to variations of the effective exchange coupling in the magnetic film.<br> This assumption is supported by the observed dependence of the saturation magnetic field on the period of the<br> zero-field spin spiral. Moreover, magnetic skyrmions appear in an external magnetic field only in one type of<br> dislocation line area, which we impute to the different pinning properties of the dislocation lines."本数据集关联的发表论文内容如下：三层原子层铁（Fe）薄膜与铱(111)衬底（Ir(111)）之间的失配所诱发的大外延应力，可通过形成高密度位错线网络得以缓解。自旋极化扫描隧道显微镜（Spin-polarized scanning tunneling microscopy）研究显示，铁薄膜内的应力存在局域变化，且该变化会影响体系的磁状态。可区分出两类位错线区域，两类区域均呈现出自旋螺旋结构，其周期随应力变化，范围为3至10纳米。借助简化的微磁学模型，我们将自旋螺旋周期的变化归因于磁性薄膜中有效交换耦合的涨落。该假设得到了观测结果的支撑：饱和磁场与零场自旋螺旋的周期之间存在依赖关系。此外，仅在其中一类位错线区域内，外磁场条件下才会出现磁性斯格明子（magnetic skyrmions），我们将此现象归因于不同位错线具有各异的钉扎特性。