Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Multiferroic Oxide Thin Films and Heterostructures I (joint session KFM/TT/MA)

TT 55.11: Vortrag

Mittwoch, 14. März 2018, 12:30–12:45, EMH 225

Mechanical reading of ferroelectric polarity — •Gustau Catalan¹, Kumara Cordero², and Neus Domingo² — ¹ICREA-Institucio Catalana de Recerca i Estudis Avançats, Barcelona, Catalunya — ²ICN2-Institut Catala de Nanociencia i Nanotecnologia, Barcelona, Catalunya

Flexoelectricity is polarization induced by strain gradient. It is closely related to piezoelectricity (polarization induced by strain), a phenomenon for which it was originally viewed as potential substitute. More recently, however, it has become apparent that very exciting new functionalities can be achieved when we combine both flexoelectricity and piezoelectricity in ferroelectrics.

One such functionality, reported in 2012, was the seminal discovery that strain gradients induced by the tip of an atomic force microscope (AFM) could mechanically *write* ferroelectric domains without applying any voltage. Here, we would like to report the complementary effect: the combination of flexoelectricity and piezoelectricity allows *reading* the polar sign of ferroelectric domains from pure (voltage-free) mechanical response.