SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.30: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Exchange bias in PtMn/Co: New insights into its origin and possibilities for manipulation — •Beatrice Bednarz1, Maria-Andromachi Syskaki2, Rohit Pachat3, Liza Herrera-Diez3, Armin Kleibert4, Mathias Kläui1, and Gerhard Jakob1 — 1Johannes Gutenberg-University, Mainz, Germany — 2Singulus Technology AG, Kahl, Germany — 3Université Paris-Saclay, Palaiseau, France — 4Paul Scherrer Institute, Villigen PSI, Switzerland
Exchange bias is fundamental for many spintronic devices as a means of pinning the direction of the ferromagnetic layer [1,2] and for exerting an intrinsic magnetic field for field-free switching [3]. One of the most commonly used antiferromagnets for this purpose is PtMn [4]. It has a CuAu-I type structure with a high bulk Néel temperature of 975 K and high thermal stability [4]. In this study, we report on new insights into its magnetic structure and the effect on the exchange bias. The magnetic domains were imaged for crystalline as well as polycristalline PtMn by x-ray magnetic linear dichroism (XMLD) photo-emission electron microscopy (PEEM). We found that the drastic difference in the exchange bias is not caused by a difference in the domain size but only by differences in the domain orientations. Furthermore, we show that the magnetic properties of the exchange biased system can be reversibly controlled by ionic liquid gating.
[1] A.V. Khvalkovskiy et al., J. Phys. D: Appl. Phys. 46, 074001 (2013). [2] S.S.P. Parkin et al., J. Appl. Phys. 85, 5828 (1999). [3] A. van den Brink et al., Nat. Commun. 7, 10854 (2016). [4] G.W. Anderson et al., J. Appl. Phys. 87, 5726 (2000).