Lecture: Ultrafast manipulation of order in compound and textured magnetic materials

  • Date:
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Å80109 and zoom
  • Lecturer: Dr. Phoebe Tengdin, École polytechnique fédérale de Lausanne
  • Website
  • Contact person: Hermann Dürr
  • Föreläsning

The interactions between electrons, spins, and phonons in magnets, superconductors and other strongly correlated electron materials hold the key to their emergent properties and provide a route to manipulating their phases. While the fundamental length- and time-scales for these phenomena are nanometers (exchange length) and femtoseconds (exchange splitting), tools that enable the exploration of their interactions and functional properties have only recently become available. Using a combination of ultrafast lasers, electron, and x-ray pulses, we can go beyond merely observing the static lattice and band structure, to manipulating a material as it undergoes a light-induced phase transition. In this talk I will describe advances in ultrafast X-ray and electron beam spectroscopy and imaging that allow us to directly observe and manipulate new phases of matter in magnetic and other strongly correlated electron materials. Specifically, I will show examples of how we can drive nonequilibrium phase transitions, manipulate order, and observe new material physics in a half-metallic heusler alloy Co2MnGe and skyrmion hosting ferrimagnetic insulator Cu2OSeO3.