X-ray coherent studies of the dynamics in Arrays of interacting MesoSpins

利用散斑和相关光谱的X射线相干散射将被用来探测不同阵列几何形状的纳米磁岛阵列中磁化强度的时间演化。作为温度和外加磁场的函数，我们将探索作为阵列几何函数的单个力矩的动态以及它们的集体行为。修改阵列间距和对称性允许定制元件间偶极-偶极相互作用的影响。这项工作的目的是探索磁有序的基本模型。通过利用电子束光刻实现的控制，可以设计阵列结构，其中磁性元素充当原子矩的介旋类似物，并允许测试和探索Ising和2D-XY模型。该项目的新颖性是专注于跨相变的时间研究，时间尺度从几十微秒到几分钟不等。开放时间窗口将支持对相阵的早期研究，这些相阵一直局限于缓慢的动力学和有限的视场。这些数据将在中央设施使用共振散射进行记录，这是沃里克、NSLS-2和乌普萨拉大学材料物理学小组的合作成果

X-ray coherent scattering exploiting speckle and correlation spectroscopies will be used to probe the temporal evolution of the magnetisation in array of nanopatterned magnetic islands on different array geometries. As a function of temperature and applied field, both the dynamics of the individual moments as well as their collective behaviour will be explored as a function of array geometry. Modifying the array spacing and symmetries allows the impact of the inter-element dipole-dipole interactions to be tailored. The aim of the work is to explore fundamental models of magnetic ordering. By exploiting the control enabled through electron beam lithography, array architectures can be designed in which magnetic elements act as mesospin analogues to atomic moments and allow Ising and 2D-XY models to be tested and explored. The novelty of project is the focus on temporal studies across phase transitions with timescales ranging from tens of microseconds to minutes. Opening up the time window will support earlier studies of phase arrays which have been limited to slow dynamics and limited fields of view. The data will be recorded using resonant scattering at central facilities and is a collaboration between Warwick, NSLS-2 and the materials physics group at Uppsala University