Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.60: Poster

Tuesday, September 6, 2022, 17:30–20:00, P2

Imaging the magnetic structure of antiferromagnetic PtMn — •Beatrice Bednarz, Christin Schmitt, Hendrik Meer, Adithya Rajan, Mathias Kläui, and Gerhard Jakob — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

Antiferromagnetic materials (AFM) are gaining increasing interest in the recent years because of their high potential for new spintronic devices with very high bit packing densities and ultrafast dynamics. [1] PtMn is widely used, especially to pin ferromagnetic layers in magnetic devices. [2] Pt₅₀Mn₅₀ has a CuAu-I type structure with a high bulk Néel temperature of 975 K. [3] THz spin dynamics [4] and periodic chiral structures [5] have been predicted in PtMn. However, to use it as the active layer of spintronic devices, the first crucial step is to read out its magnetic state. This was achieved now by imaging the domains with x-ray magnetic linear dichroism (XMLD). Additionally, the domain size was determined from a Fourier transform of the XMLD images for 40 nm PtMn grown on MgO (001) and capped with 1.6 nm Al. It shows a distinct ring, corresponding to an average domain periodicity of approximately 650 nm.

[1] V. Baltz et al., Rev. Mod. Phys. 90, 015005 (2018). [2] G.W. Anderson et al., J. Appl. Phys. 87, 5726 (2000). [3] L. Pál et al., J. Appl. Phys. 39, 538 (1968). [4] K. Kang et al., ArXiv:2112.13954 [Cond-Mat] (2021). [5] Md.R.K. Akanda et al., Phys. Rev. B 102, 224414 (2020).