SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.51: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Super-Nyquist-sampling MOKE elucidates the role of interfacial exchange coupling when measuring spin Hall effect in the noncollinear antiferromagnet Mn₃Ir — Piet Urban¹, Rouven Dreyer¹, James M Taylor¹, •Srishti Dongare¹, Binoy K Hazra², Stuart S P Parkin², and Georg Woltersdorf¹ — ¹Institute of Physics, Martin Luther University Halle-Wittenberg, 06120 Halle, Germany — ²Max Planck Institute for Microstructure Physics, 06120 Halle, Germany

Non-collinear antiferromagnets (AFs) have been found to serve as an efficient source of intrinsic spin Hall effect (SHE). However, the role of their chiral domain structure in this process, and the transmission of the resulting spin current across interfaces with ferromagnets (FMs), remain open questions. Using a combination of electrically-detected spin-torque ferromagnetic resonance (ST-FMR) and optically-detected super-Nyquist-sampling magneto-optical Kerr effect (SNS-MOKE) measurements, we investigate the SHE generated by the non-collinear spin texture of Mn₃Ir in heterostructures with Ni₈₀Fe₂₀. The enhanced damping due to interfacial exchange coupling between the AF and FM complicates extraction of the spin Hall angle (SHA) using ST-FMR. In contrast, spatially-resolved SNS-MOKE studies allow for a local detection of the SHA, and reveal modifications of the coupling-induced anisotropy upon exposure to a combination of DC current and RF power. These findings offer us a path to quantify the SHE generated by an AF more accurately, as well as to control their domain structure in a local manner.