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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Focus: Domains and Domainwalls in (Multi)Ferroic II
KFM 4.9: Vortrag
Dienstag, 28. März 2023, 12:30–12:50, POT 51
Novel functionalities at twin domain crossings — •Kumara Cordero-Edwards1,2, Philippe Tückmantel2, Iaroslav Gaponenko2, Sahar Saremi3, Lane Martin3,4, and Patrycja Paruch2 — 1Institut Català de Nanociencia i Nanotecnología, Barcelona, Catalonia. — 2DQMP, University of Geneva, Geneva, Switzerland — 3Department of Materials Science and Engineering, University of California, Berkeley, USA. — 4Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA.
In ferroelectrics, domain walls (DWs) are thin interfaces separating regions with different orientations of electric polarization. These interfaces can present physical properties quite different from the surrounding domains, allowing them to be used as active components in future device applications. Recent studies of DWs using scanning probe microscopy (SPM) have focused on mapping their response to different parameters in order to understand their structure-property relationships. In particular, the role of high strain gradients present at ferroelectric twins has been shown to enhance their electrical conduction and can lead to complex rotational polarization textures.
Here, I will present our investigation of ferroelastic twin domains in epitaxial PbTiO3 thin films grown on SrTiO3, explored with SPM. Our results suggest a complex polarization structure around the twin domains, which present an unusual and distinct lateral PFM signal, associated with a distinct current signature. Moreover, twin domain crossings show a unique mechanical response distinct from the surrounding ferroelectric phase, and enhanced electrical conduction.