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

利用散斑和相关光谱的X射线相干散射将用于探测不同阵列几何形状的纳米图案化磁性岛阵列中磁化强度的时间演变。作为温度和外加磁场的函数，无论是动态的个人时刻，以及他们的集体行为将被探索作为阵列几何形状的函数。修改阵列间距和对称性允许调整元件间偶极-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。通过利用通过电子束光刻实现的控制，可以设计阵列架构，其中磁性元件充当原子矩的中自旋模拟物，并允许测试和探索Ising和2D-XY模型。该项目的新奇之处在于专注于时间尺度从几十微秒到几分钟的相变时间研究。开放的时间窗口将支持早期的相控阵列的研究已被限制到缓慢的动态和有限的视野。这些数据将在中心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组之间的合作

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