Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.38: Poster

Tuesday, March 18, 2025, 10:00–12:30, P1

Quantitative study of the spin Hall magnetoresistance in a yttrium iron garnet/Pt heterostructure — •Denise Reustlen, Sebastian Sailler, Davina Schmidt, Richard Schlitz, Michaela Lammel, and Sebastian T. B. Goennenwein — Department of Physics, University of Konstanz, 78457 Konstanz

The spin Hall magnetoresistance (SMR) is a well-known and extensively studied phenomenon in the field of spintronics. The SMR is most commonly observed in heterostructures consisting of a ferromagnetic insulator and a normal metal with a large spin orbit interaction. In this study, we use yttrium iron garnet as the ferrimagnetic insulator and platinum as the normal metal due to its relatively large spin Hall angle. While the SMR is usually measured locally, on a single Hallbar structure, the data obtained often are used to gauge the magnetic quality of the underlying magnetic insulator or of the magnet/metal interface. Interestingly, however, up to now little is known about the SMR statistics in one Hallbar and the scatter of the SMR magnitude across several Hallbars on a single sample. Given that the SMR is a local effect, it is relevant to ascertain the significance of a single measurement as a representative measure for the entire sample. We thus have patterned more than 200 nominally identical SMR microstructures into a single YIG/Pt bilayer and studied the statistical distribution of the SMR as a function of position across the entire sample. Our results demonstrate that the SMR amplitude is robust and provide the basis for a consistent comparison of the SMR.

Keywords: spin Hall magnetoresistance; statistics