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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 2: Focus Session: Defects and Interfaces in Multiferroics 1

KFM 2.4: Talk

Monday, September 5, 2022, 10:40–11:00, H5

Strain-induced multiferroic ribbons in non-multiferroic phase of MnWO₄ — •Lea Forster¹, Shingo Toyoda², Manfred Fiebig^1,2, Taka-hisa Arima^2,3, Yoshinori Tokura^2,4,5, and Naoki Ogawa^2,5,6 — ¹Deptartment of Materials, ETH Zurich, Switzerland — ²RIKEN CEMS, Saitama, Japan — ³Department of Advanced Materials Science, University of Tokyo, Kashiwa, Japan — ⁴Tokyo College, University of Tokyo, Tokyo, Japan — ⁵Department of Applied Physics, University of Tokyo, Tokyo, Japan — ⁶PRESTO, JST, Kawaguchi, Japan

Local structures, such as structural defects, interfaces, and domain walls have the potential to exhibit different physical properties than the bulk. The occurrence of magnetic and electric orders in a confined area may be of particular interest for technological applications, for example, to electrically control the magnetization in memory devices. However, probing local multiferroic structures is challenging caused by a lack of experimental techniques. In this study, we demonstrate a ribbon-shaped, spatially confined multiferroic phase in a non-multiferroic environment in MnWO₄. We use optical second harmonic generation imaging to show that a multiferroic phase can be generated by local strain within a non-multiferroic bulk structure. Furthermore, we reveal within the confined multiferroic regions domains with different electric polarization directions and demonstrate deterministic writing of a multiferroic state by the application of strain.