Thema der Dissertation:
Studying all-optical switching in GdFe using both single and double laser pulse
Studying all-optical switching in GdFe using both single and double laser pulse
Abstract: This thesis explores how ultrafast laser pulses can control magnetization in GdFe ferrimagnetic alloys, focusing on single- and double-pulse all-optical switching as well as domain wall (DW) motion. Using advanced magnetic imaging techniques such as PEEM and Kerr microscopy, we reveal how deterministic switching can break down near domain walls due to both intrinsic material properties and extrinsic laser-induced fluctuations.Furthermore, we studied double-pulse switching using two laser pulses with variable time delays. Optimal re-switching was observed at delays between 4–40 ps, particularly when the first pulse is just above the switching threshold and the second pulse has 50–70% of its fluence. Atomistic spin simulations supported these findings by highlighting the role of electron-lattice temperature equilibration in the switching dynamics.
Additionally, Additionally, we study how laser excitation drives DW motion, influenced by factors like entropic torque and magnon spin transfer torque.These findings provide valuable insights into ultrafast, energy-efficient magnetic switching and domain control, with promising implications for next-generation memory technologies.
Additionally, Additionally, we study how laser excitation drives DW motion, influenced by factors like entropic torque and magnon spin transfer torque.These findings provide valuable insights into ultrafast, energy-efficient magnetic switching and domain control, with promising implications for next-generation memory technologies.
Time & Location
May 19, 2025 | 04:30 PM
Hörsaal A (1.3.14)
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)