Event Details

Speaker: Alexander Buzdakov Interactive Fully Electrical Vehicles Srl (IFEVS), Italy

The ultrafast manipulation of spin states holds significant promise for the advancement of high-speed and energy-efficient data technologies. Utilizing femtosecond laser pulses is an efficient method for triggering and examining ultrafast dynamics. The process of switching between two states (up and down) using a laser pulse is referred to as all-optical switching (AOS). Initially discovered in ferrimagnetic 3d-4f alloys, AOS has been the subject of extensive experimental and theoretical research to elucidate its underlying mechanisms. Theoretical approaches have included the atomistic model, the s-d model, and the microscopic three-temperature model (M3TM). However, a comprehensive understanding of the processes that initiate AOS remains a topic of ongoing debate. In this study, we theoretically and experimentally investigate various switching scenarios in Gd/FeCo multilayers, which exhibit distinct exchange interactions and anisotropies compared to GdFeCo alloys. We place particular emphasis on exchange relaxation mechanisms, as they are crucial drivers of ultrafast switching.

About the speaker: Alexander earned bachelor’s and master’s degrees from the Moscow Institute of Physics and Technology (MIPT). He had the opportunity to work in the field of spintronics, specifically working on spin-torque diodes, at the Russian Quantum Center (RQC). He explored the realm of magnonics, focusing on non-linear processes, at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) in Germany. Currently, he is involved in the European project COMRAD, which primarily concentrates on ultrafast magnetic recording.