NANOSCALE INVESTIGATIONS OF ELECTRICAL PROPERTIES IN RELAXOR Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ THIN FILMS DEPOSITED ON PLATINUM AND LaNiO₃ ELECTRODES BY MEANS OF LOCAL PIEZOELECTRIC RESPONSE

Abstract

At very low temperature (450 • C), (111)-oriented and polycrystalline 0.7Pb(Mg 1/3 Nb 2/3 ) O 3 -0.3PbTiO 3 (PMN-PT) thin films have been grown on platinum (Pt) and lanthium niobate (LaNiO 3 ) bottom electrodes respectively. Macroscopic measurements reveal lower coercive fields for PMN-PT grown on LaNiO 3 compared to on platinum, while the piezoelectric coefficient d 33 is greater. At the nanometer scale, local piezoelectric hysteresis loops show that the voltages required for domain switching and piezoelectric response are the highest for PMN-PT deposited on LaNiO 3 . The electrical results can be explained by taking into account the effects induced by both electrodes on the surface morphology and structural properties of the films.

Microstructure and Nanoscale Piezoelectric/Ferroelectric Properties in La2Ti2O7 Thin Films Grown on (110)‐Oriented Doped Nb:SrTiO3 Substrates

“…Further experimental details about PFM imaging and piezoloops recording can be found elsewhere. [32][33][34][35][36][37][38] …”

“…This asymmetry has already been reported on classical ferroelectric and relaxor thin films such as PbZr x Ti 1Àx O 3 , Pb 1À3y/2 La y Zr x Ti 1Àx O 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 films. [38,50,52] It is commonly attributed to an internal built-in electric field existing at the bottom interface or/and to the tip/ film/electrode hetero-structure which brings its own asymmetry. As a result, we get a coercive voltage for such kind of film around 0.5 V.…”

Insight on the ferroelectric properties in a (BiFeO3)2(SrTiO3)4 superlattice from experiment and ab initio calculations

“…Poling experiments were performed to highlight the local ferroelectricity in the films while local piezoloops were acquired to measure the switching behavior. 6 The FE domain pattern was investigated by OP-PFM and IP-PFM imaging. As seen in Fig.…”

Enhancement in nanoscale electrical properties of lead zirconic titanate island fabricated by focused ion beam

“…The experiments are carried out by considering the so-called "infield" mode, which presents the particular characteristic, to be very close to the one used for "macroscopic" hysteresis loops recording. [17][18][19] In brief, in this mode, a continuous bias voltage is applied between the tip and the ground bottom electrode together with an alternative voltage of the form V = V ac cos͑2ft͒ which can induce the vibration of the sample. The signal generated by the piezoelectric vibration ͑PFM͒ and feedback from the photodetector to a lock-in amplifier is of the form A cos .…”