Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Spin: Transport, Orbitronics and Hall Effects I
MA 46.4: Talk
Thursday, March 19, 2020, 10:15–10:30, HSZ 403
Spin Hall magnetoresistance in ferromagnet/ Pt heterostructures with 4f moments — •Kevin Geishendorf1, Richard Schlitz2, Michaela Lammel1, Dhavala Suri3, Jagadeesh Moodera3, 4, Kornelius Nielsch1, Sebastian T.B. Goennenwein2, and Andy Thomas1 — 1Leibniz Institute for Solid State and Materials Research, Dresden — 2Institut für Festkörper- und Materialphysik , Technische Universität Dresden — 3Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, MIT — 4Department of Physics, MIT
The spin Hall magnetoresistance (SMR) is a powerful tool to investigate a variety of magnetic systems. Previous experiments mainly focused on materials with d moments. d orbitals are usually the outermost magnetic electron shells and thus can overlap with the electron shells of neighbouring ions or atoms resulting in strong interactions. However, the interactions are considered to be weaker in magnetic materials with 4f moments due to the strong localization and screening of the 4f electrons. We measure the magnetoresistive response (MR) in GdN/Pt and EuS/Pt heterostructures to investigate the coupling between 4f moments and a spin accumulation. The GdN/Pt heterostructure exhibits a clear MR with a symmetry characteristic for SMR. In contrast, although having a similar magnetic response the EuS/Pt heterostructure exhibits a much smaller MR. We discuss the possible origin of the MR in both heterostructures in view of the presences or absence of d electron levels near the Fermi energy.