Ultrafast Magnetism in Frustrated Materials

Joint project: Utrecht University (UU) – Radboud University Nijmegen (RU) – HMFL- FELIX How fast can magnetic order be established in quantum magnetic systems, and on what timescale do short-range magnetic correlations evolve into long-range ordered spin states? While equilibrium theories can describe how exchange correlations stabilize magnetically ordered ground states, they do not capture the non-equilibrium kinetics of ordering, nor the ultimate timescale on which order emerges and settles. To address this question, this PhD project focuses on frustrated magnets, where strong but competing exchange interactions suppress conventional long-range order despite strong local correlations. This intrinsic competition makes magnetism in these systems highly sensitive to external perturbations, which can tip the balance between competing interactions and unlock hidden correlations that drive ordering. Using world-class experimental research facilities, you will synthesize frustrated magnetic materials, determine their equilibrium states using neutron scattering, and drive them far from equilibrium using femtosecond laser pulses and mid-/far-infrared excitation, directly targeting the crystal lattice as the origin of magnetic frustration. Time-resolved magneto-optical imaging then enables extraction of intrinsic magnetic response times and direct real-time tracking of emergent magnetic order across timescales ranging milliseconds to femtoseconds. The position is a joint Utrecht–Nijmegen appointment, actively collaborating with and working at both sites.