SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.37: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Kerr microscopy for all-optical helicity-dependent magnetization switching (AOHDS) — •Lucas Vollroth1, Marcel Kohlmann1, Kristýna Hovořáková2, Eva Schmoranzerová2, Markus Münzenberg1, and Jakob Walowski1 — 1Greifswald University, Greifswald, Germany — 2Charles University, Prague, Czech Republic
The demand of data storage capabilities is growing rapidly since the invention of the computer. The development of big data in science and economy intensifies this evolution. To fulfill the demand of storage capabilities there is need of new data storage techniques. One of these new techniques is heat assisted magneto recording (HAMR) where the bit size is drastically decreased by high coercive fields of granular FePt.
Besides the heat assisted writing with a magnet, we are investigating the writing on HAMR media with all-optical helicity-dependent switching (AOHDS) as a novel data storage technology [1]. Wide field Kerr-microscopy is a well-suited method to explore and analyze the outcome of our AOHDS experiments.
We present a build from scratch and cost-efficient Kerr microscope for the observation of magnetic domains and writing with AOHDS on HAMR media simultaneously. It can also be used for the investigation of skyrmions and can be refined to investigate magnetization changed in a pump-probe experiment after the deposition of ultrashort laser pulses on magnetic thin films.
[1] John, R. et al. Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses. Sci Rep 7, 4114 (2017)