Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.23: Poster
Thursday, September 8, 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)