About the Project
Due to the repeating in-plane array structure sharp peaks are seen in reciprocal space at positions qx=2/a where a is the array period in the beam direction (fig. 1). Coherent diffraction introduces speckle which arise from disordered phases present in the sample. Quantitative information on the dynamics can be gleaned from intensity-intensity temporal autocorrelation functions and fitted to suitable models accounting for static (non-magnetic) and dynamic (magnetic) signals [8,9].
The PhD project will involve both explorative and targeted investigations in which you will build and develop suitable modelling frameworks to describe more complex artificial spin ice structures with hierarchical complexity; starting with simple Ising chains, then square ices including the Shatki lattice before studying multi-element arrays. You will develop metrologies to explore the temporal evolution using intensity-intensity correlation functions and compare directly x-ray and optical studies with direct space PEEM images. Your results will yield new insights into the role of the lattice in inducing order and provide collaborating evidence from the more myopic microscopy studies. Near criticality, i.e. the ordering temperature TC, dynamics within the elements will also occur. As these are not correlated, the coherent scattering will be visible at incommensurate positions. This new data have never been explored and will provide an additional XPCS channel which will be compared directly the speckle data.
The project is the result of a long-standing and close collaboration between the group at Warwick [Hase/Bikondoa], and the materials physics group at Uppsala [Hjörvarsson/Kapaklis]. You will be expected to work closely with the Uppsala team and spend time in their research group, participate in joint experiments and design and make new samples. X-ray experiments will be performed at central facilities. The work is highly interdisciplinary, allowing you to develop both experimental and analytical skills.
The Physics department is proud to be an IOP Juno Champion and a winner of an Athena Swan Silver Award, reflecting our commitment to equal opportunity and to fostering an environment in which all can excel.
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