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DS: Fachverband Dünne Schichten

DS 5: Thin Oxides and Oxide Layers

DS 5.3: Vortrag

Dienstag, 18. März 2025, 14:30–14:45, H3

Tuning the interlayer coupling in La_0.7Sr_0.3MnO₃ / LaNiO₃ multilayers with strong perpendicular-magnetic-anisotropy — •Jörg Schöpf¹, Valentina Piva¹, Paul H. M. van Loosdrecht¹, Padraic Shafer², Divine P. Kumah^3,4, Xuanyi Zhang^3,4, Lide Yao⁵, Sebastiaan van Dijken⁶, and Ionela Lindfors-Vrejoiu¹ — ¹Institute of Physics II, University of Cologne, Cologne, Germany — ²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, USA — ³Department of Physics, Duke University, Durham, USA — ⁴Department of Physics, North Carolina State University, Raleigh, USA — ⁵OtaNano-Nanomicroscopy Center, Aalto University, Aalto, Finland — ⁶Department of Applied Physics, Aalto University School of Science, Aalto, Finland

We report on the magnetic interlayer coupling between Ru-substituted La_0.7Sr_0.3MnO₃ thin films separated by few unit cell thin LaNiO₃ spacers, grown by pulsed-laser-deposition and investigated by SQUID-mangetometry, magnetotransport and the magneto-optive-Kerr effect. The magnetic anisotropy in Ru-substituted La_0.7Sr_0.3MnO₃ thin films, in combination with light compressive strain of a LSAT substrate, allows to tune the magnetic anisotropy from easy-plain to strong perpendicular-magnetic-anisotropy. LaNiO₃, allows for strong FM- or AFM-coupling between the manganite layers depending on spacer thickness. We propose a layer-by-layer type magnetization reversal in the case of strong PMA, introduced by substituting 10% of Mn by Ru, while films with lower substitution of 5% and weaker PMA instead show signs of collective, spin-flop-type transitions.

Keywords: Exchange Interaction; Magnetism; Synthetic antiferromagnetic multilayers