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Disputation Florian Jakobs

15.03.2023 | 16:00
Thema der Dissertation:
Computer simulation of laser-induced ultrafast demagnetization and switching dynamics of magnetically ordered materials
Abstract:The amount of data processed by the world is increasing exponentially and doubles roughly every three years. However, magnetic storage technology is falling behind, and only small incremental improvements, such as heat-assisted magnetic recordings, have been found in this area. In order to keep up with the ever-increasing need for data processing and information storage, fundamentally new approaches need to be explored.
Single-pulse magnetic switching using ultrashort, femtosecond-long laser pulses promises a new solution to this problem and has been experimentally demonstrated in the ferrimagnetic alloys GdFeCo and recently in MnRuGa.
However, there are still many open questions regarding the mechanisms behind ultrafast switching that need answers, such as how much of our understanding from femtosecond switching of GdFeCo can be transferred to MnRuGa and to switching using picosecond-long electric pulses.
In this thesis, laser-induced ultrafast demagnetization and switching of magnetically ordered materials were investigated using atomistic spin-dynamics simulations. During the computer simulations, the classical Heisenberg model and the stochastic Landau-Lifshitz-Gilbert equation were used and solved numerically. The simulation results were compared to experimental measurements from coworkers, addressing open questions regarding GdFeCo and MnRuGa, as well as exchange-enhanced magnetization dynamics in antiferromagnets.

Zeit & Ort

15.03.2023 | 16:00

Hörsaal A (1.3.14)
Fachbereich Physik, Arnimallee 14, 14195 Berlin