Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 11: Functional Antiferromagnetism

MA 11.10: Vortrag

Montag, 18. März 2024, 17:30–17:45, EB 202

The impact of local exchange coupling on spin-Hall effects measurements in non-collinear antiferromagnets — •Rouven Dreyer¹, James M. Taylor¹, Piet Urban¹, Binoy K. Hazra², Stuart S. P. Parkin², and Georg Woltersdorf^1,2 — 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) relevant for spintronic devices. However, the role of their chiral domain structure, 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 Ni₈₀Fe₂₀F. 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, 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 and RF currents. These findings open a path to quantify the SHE generated by an AF more accurately. Moreover, we demonstrate an efficient control mechanism for setting the exchange bias by exposing the AF to a combination of small bias fields and current induced heating.

Keywords: non-collinear Antiferromagnet; Spin Hall effect; SNS-MOKE; Exchange Bias; Mn3Ir