SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.40: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Manipulation of multiferroic properties in h-YMnO₃ upon substitution at the Mn-site with non-magnetic impurities — •M. Giraldo¹, M. Lilienblum¹, E. Gradauskaite¹, H. Sim², J.-G. Park², Th. Lottermoser¹, and M. Fiebig¹ — ¹ETH Zurich — ²Seoul National University

Chemical substitution is an effective way to tailor the properties of complex oxides. For example, pronounced effects in domain wall conductivity or mixing of magnetic groundstates in h-RMnO₃ have been explored by chemical substitution at the Mn-site. Here, we investigate the enhancement and suppression of electric and magnetic long-range order in h-YMnO₃ upon substituting Mn by Al and Ga. By combining second-harmonic spectroscopy and piezoresponse force microscopy, a complete suppression of ferroelectric order upon 20% Al substitution was found. In contrast, substitution with Ga upon 50% leads to an enhancement of the ferroelectric (FE) response. This is due to the chemical pressure induced by the distinct ionic sizes of Al, Ga & Mn. On the level of the FE domains, the suppression of the FE order manifests in a progressive size decrease upon increased Al concentration while there is no size variation upon Ga substitution. On the magnetic level, we find a progressive decrease of the ordering temperatures. This is due to the direct perturbation of the magnetic sublattices formed by the Mn³⁺ moments and the progressive dilution of the magnetic long-range order. By tracing changes in the inherent properties of these systems, we aim to broaden the understanding for new routes in the manipulation of ferroic properties in these compounds.