SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Thin Film Properties (joint session DS/KFM)
KFM 5.1: Vortrag
Dienstag, 28. März 2023, 10:00–10:15, SCH A 315
Defect nanostructure and its impact on magnetism of α-Cr2O3 thin films — •Ihor Veremchuk1, Oskar Liedke1, Pavlo Makushko1, Tobias Kosub1, Natascha Hedrich2, Oleksandr Pylypovskyi1, Fabian Ganss1, Maik Butterling1, René Hübner1, Eric Hirschmann1, Ahmed Attallah1, Andreas Wagner1, Kai Wagner2, Brendan Shields2, Patrick Maletinsky2, Jürgen Fassbender1, and Denys Makarov1 — 1Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden, Germany — 2Department of Physics University of Basel, Switzerland
Thin films of the magnetoelectric insulator Cr2O3 are technologically relevant for energy-efficient magnetic memory devices controlled by electric fields. We experimentally investigated the defect nanostructure of 250-nm-thick Cr2O3 thin films prepared under different conditions on single crystals of Al2O3 (0001) and correlate it with the integral and local magnetic properties of the samples. Positron annihilation spectroscopy reveals that the Cr2O3 thin films are characterized by the presence of complex defects at grain boundaries, formed by groups of monovacancies, coexisting with monovacancies and dislocations. The defect nanostructure strongly affects the magnitude of the electrical readout. Furthermore, the presence of larger defects like grain boundaries has a strong influence on the pinning of magnetic domain walls in thin films. We show that the Néel temperature is hardly affected by the formed defects in a broad range of deposition parameters.