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MA: Fachverband Magnetismus

MA 11: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 11.5: Vortrag

Dienstag, 18. März 2025, 10:30–10:45, H18

Detection of dynamic x-ray magnetic linear dichroism in NiO — •Timo Kuschel¹, Johannes Demir¹, Olga Kuschel², Joachim Wollschläger², and Christoph Klewe³ — ¹Bielefeld University, Germany — ²Osnabrück University, Germany — ³Advanced Light Source (ALS), Berkeley, USA

Spin transport through thin antiferromagnetic layers such as NiO has been studied by ferromagnetic resonance (FMR) spin pumping [1], spin Seebeck effect [2], non-local magnon spin transport [3] and x-ray detected FMR (XFMR) [4]. In all these experiments, the spin current has been identified in an adjacent Pt layer [1-3] or FeCo film [4] via inverse spin Hall effect or dynamic x-ray magnetic circular dichroism, respectively, after having the NiO layer already passed.

In this contribution, we study Fe₃O₄/NiO/Pt [5] by XFMR and present the identification of dynamic x-ray magnetic linear dichroism (XMLD) [6] at the Ni L edges directly in the NiO layer for FMR spin pumping in the adjacent Fe₃O₄ layer. We will analyze the XFMR response depending on the NiO thickness. Further, we will discuss coupling phenomena at the NiO-Fe₃O₄ interface vs. spin transport through the NiO layer as the origin of the dynamic XMLD response.

[1] H. L. Wang et al., Phys. Rev. Lett. 113, 097202 (2014)

[2] W. Lin et al., Phys. Rev. Lett. 116, 186601 (2016)

[3] G. R. Hoogeboom et al., Phys. Rev. B 103, 144406 (2021)

[4] M. Dabrowski et al., Phys. Rev. Lett. 124, 217201 (2020)

[5] L. Baldrati et al., Phys. Rev. B 98, 014409 (2018)

[6] C. Klewe et al., New J. Phys. 24, 013030 (2022)

Keywords: antiferromagnets; NiO; spin transport; x-ray detected ferromagnetic resonance; x-ray magnetic linear dichroism