Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.26: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Kerr microscopy for all-optical helicity-dependent magnetization switching — •Lucas Vollroth¹, Marcel Kohlmann¹, Kristýna Hovořáková², Eva Schmoranzerová², Markus Münzenberg¹, and Jakob Walowski¹ — ¹Greifswald University, Greifswald, Germany — ²Charles University, Prague, Czech Republic

The ever growing demand for data storing capacities requires the development of high bit density data storage devices with fast read and write capabilities. New generation heat assisted magnetic recording devices (HAMR) emerging the market are promising candidates decreasing bit sizes. Simultaneously, the recording media based on nanometer sized FePt grains are suitable for other writing approaches like the all-optical helicity-dependent switching (AOHDS) [1]. We investigate this method for potential future applications of HAMR media. 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. The setup can be implemented in pump-probe experiments to investigate magnetization changes after the deposition of ultrashort laser pulse energies in magnetic thin films. Besides measurements on hard drive media, the microscope can also be used for the observation of skyrions.
[1] John, R. et al. Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses. Sci Rep 7, 4114 (2017)