Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.64: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Néel vector readout by spin Hall magnetoresistance in NiO/Pt thin films — Lorenzo Baldrati1, •Andrew Ross1,2, Tomohiko Niizeki3, Christoph Schneider1, Rafael Ramos3, Joel Cramer1,2, Olena Gomonay1, Mariia Filianina1,2, Tatiana Savchenko4, Daniel Heinze1, Armin Kleibert4, Eiji Saitoh3,5, Jairo Sinova1, and Mathias Kläui1,2 — 1Institute of Physics, Johannes Gutenberg-University Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, Germany — 3Advanced Institute for Materials Research, Tohoku University, Japan — 4Swiss Light Source, PSI, Switzerland — 5Institute for Materials Research, Tohoku University, Japan
Electrically reading the orientation of the Néel vector is fundamental for the development of antiferromagnetic (AFM) spintronics. Here, we report on spin Hall magnetoresistance (SMR) measurements of a AFM, thin film epitaxial nickel oxide (NiO)/platinum (Pt) heterostructure on MgO (001). We find that the resistance of the Pt film depends on the angle θ between an injected charge current Jc and the Néel vector of the NiO, N. It exhibits the characteristic sin2(θ) dependence for SMR signals, but with a 90 ∘ shift as compared to SMR signals obtained for insulating ferrimagnets. The strength of the SMR signal increases for increasing field, with an onset of the signal at 1-3 T[1] and we propose a model based on the movement of magnetoelastic domains. From the observed SMR ratio, we estimate the spin mixing conductance at the NiO/Pt interface to be greater than 1x1014 Ω−1 m−2. [1]Baldrati et al, arXiv:1709.00910 (2017)