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MA: Fachverband Magnetismus
MA 46: Spin: Transport, Orbitronics and Hall Effects I
MA 46.5: Vortrag
Donnerstag, 19. März 2020, 10:30–10:45, HSZ 403
Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures — Johanna Fischer1, Matthias Althammer1, Nynke Vlietstra1, Hans Huebl1, Sebastian T. B. Goennenwein2, Rudolf Gross1, Stephan Geprägs1, and •Matthias Opel1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
We investigate the spin Hall magnetoresistance (SMR) at room temperature in thin film heterostructures of antiferromagnetic, insulating, (0001)-oriented α-Fe2O3 (hematite) and Pt. We measure their longitudinal and transverse resistivities while rotating an applied magnetic field of up to 17 T in three orthogonal planes. For out-of-plane magnetotransport measurements, we find indications for a multidomain antiferromagnetic configuration whenever the field is aligned along the film normal [1]. For in-plane field rotations, we clearly observe a sinusoidal resistivity oscillation characteristic for the SMR due to a coherent rotation of the Néel vector [1]. The maximum SMR amplitude of 0.25% is, surprisingly, twice as high as for prototypical ferrimagnetic Y3Fe5O12/Pt heterostructures [1]. The SMR effect saturates at much smaller magnetic fields as in comparable antiferromagnets, making the α-Fe2O3/Pt system particularly interesting for room-temperature antiferromagnetic spintronic applications.
[1] J. Fischer et al., arXiv:1907.13393, submitted to Phys. Rev. Appl.