Tuning of dynamical magnetic fluctuations in Sr2IrO4 thin films: An XPCS study on ID10

We propose to investigate the tuning of magnetic fluctuations in epitaxial thin films of Sr2IrO4 by combining XRS and XPCS at ID10. The pure magnetic scattering Bragg peaks in Sr2IrO2 have a huge intensity when the incident energy is tuned to the Ir L3 edge E=11.218keV. The new EBS open up the new possibility to investigate this magnetic signal using coherent X-ray methods such as XPCS. Our previous XRS experiments using modest flux on an ESRF bending magnetic, suggest a tuning of the magnetic correlation length possibly from the modification of magnetic correlation time-scale. The aim of this proposal is to reveal the tuning of the magnetic fluctuations directly using XPCS methods at the EBS. This would represent the first direct observation of dynamically driven quasi-order from disorder state in the scientifically topical strongly correlated materials and would be a highlight in the new science challenges offered by the EBS. The proposal feasibility has been discussed with ID10.