SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.6: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Tuning all-optical magnetization switching efficiency by laser pulse wavelength variation — •Marcel Kohlmann¹, Lucas Vollroth¹, Kristýna Hovovřáková², Eva Schmoranzerová², Robin John¹, Denise Hinzke⁴, Peter Oppeneer³, Ulrich Nowak⁴, Markus Münzenberg¹, and Jakob Walowski¹ — ¹Greifswald University, Greifswald, Germany — ²Charles University, Prague, Czech Republic — ³Uppsala University, Uppsala, Sweden — ⁴Konstanz University, Konstanz, Germany

The relevance of heat-assisted magnetic recording (HAMR) motivates ongoing research and development in magnetization manipulation. We study all-optical helicity-dependent switching (AOHDS) of FePt granular media as a viable alternative method for magnetic writing of HAMR media. The interplay of magnetic dichroism and inverse Faraday effect is currently understood as driving process behind the magnetization reversal. Ab-initio calculations of magnetic dichroism and inverse Faraday effect for the switching rates of single FePt nano particles provided us with a stochastic model for the switching process. We now present data for the wavelength dependent efficiency of the writing process from 800 nm - 1550 nm. We greatly acknowledge the DFG funding within the project "Fundamental aspects of all-optical single pulse switching in nanometer-sized magnetic storage media.