Investigation of energy-efficient switching concepts for magnetic materials

Methods and Instrumentation for Synchrotron Radiation Research: Controlling spin-based phenomena

We focus on “Controlling spin-based phenomena” by the investigation of more energy-efficient switching concepts for magnetic materials. The planned activities aim at manipulating the magnetization on the ultrafast timescale of the exchange interaction, which is the strongest force in magnetism and stabilize transient magnetic states through coupled systems. We want to obtain fundamental understanding of the microscopic processes underlying the ultrafast spin/magnetization dynamics and switching. We also will provide novel conceptual approaches and strategies towards ultrafast, more energy-efficient control and switching of the magnetic order including materials design. Next to the dynamic study of exchange driven magnetization dynamics, we conduct atomic control of magnetism will that allows us to explore the physical limits of magnetic anisotropy energies in heterodimers and size controlled atomic scale magnetic clusters through a dedicated ion trap at BESSY II.

The control of ultrafast magnetic dynamics at FEMTOSPEX at BESSY II will focus on the fundamental processes of angular-momentum transfer via direct and indirect excitations, such as the recently established super diffusive spin transport. The proposed upgrade of the BESSY II FEMTOSPEX facility into an integrated DYNASPEX facility (Dynamics of Switching Processes and Excitations with X-rays) creates for both femtosecond and picosecond magnetic X-ray spectroscopy at high repetition rates an important infrastructure. BESSY VSR as an upgrade of BESSY II will be an ideal source for this research.