Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.23: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

All-optical switching of magnetically hard CoPt and L1₀-FePt in contact with a Gd-layer — •Johannes Seyd¹, Julian Hintermayr², Manfred Albrecht¹, and Bert Koopmans² — ¹Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — ²Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands

All-optical switching (AOS) by single femtosecond laser pulses promises to be an ultrafast, energy-efficient alternative to conventional writing in magnetic recording using magnetic fields. L1₀-FePt is a magnetic material with high perpendicular magnetic anisotropy (PMA), which makes it an interesting candidate for future ultrahigh-density magnetic recording applications, and for which helicity-dependent multi-shot AOS has already been confirmed [1].

Thermally-induced single-shot AOS is not only possible in ferrimagnetic alloys with a compensation temperature near room temperature, but also in synthetic ferrimagnets consisting of a ferromagnetic (multi-) layer in contact with a Gd layer, as shown for Co and Co/Ni [2]. These results suggest the possibility of reproducing the same kind of switching in other magnetic thin films, which in the case of L10-FePt would circumvent the problem of writing the magnetically hard material in magnetic recording applications.

We show the most recent results on the thermally-induced AOS behaviour of thin CoPt and L1₀-FePt films in contact with a Gd layer.

[1] R. John et al., Scientific Reports 7, 4114 (2017)

[2] M. Beens et al., Physical Review B 100, 220409(R) (2019)