Publications de Xiankui Wei | EPFL Graph Search

Flexible polarization rotation at the ferroelectric/metal interface as a seed for domain nucleation

2018

Controlled Charging of Ferroelastic Domain Walls in Oxide Ferroelectrics

Li Jin, Tomas Sluka, Ludwig Feigl, Xiankui Wei, Barbara Maraston Fraygola

Conductive domain walls (DWs) in ferroic oxides as device elements are a highly attractive research topic because of their robust and agile response to electric field. Charged DWs possessing metallic-type conductivity hold the highest promises in this aspe ...

Amer Chemical Soc2017

Neel-like domain walls in ferroelectric Pb(Zr,Ti)O-3 single crystals

Nava Setter, Tomas Sluka, Xiankui Wei

In contrast to the flexible rotation of magnetization direction in ferromagnets, the spontaneous polarization in ferroelectric materials is highly confined along the symmetry-allowed directions. Accordingly, chirality at ferroelectric domain walls was trea ...

Nature Publishing Group2016

Asymmetric structure of 90 deg. domain walls and interactions with defects in PbTiO3

Dragan Damjanovic, Nava Setter, Nicola Marzari, Anand Chandrasekaran, Ludwig Feigl, Xiankui Wei

We investigate the atomistic structure of ferroelastic-ferroelectric 90 degrees domain walls in PbTiO3 with first-principles calculations and high-resolution scanning transmission electron microscopy. We find sharp discontinuities in the variation of latti ...

Amer Physical Soc2016

Negative-pressure-induced enhancement in a freestanding ferroelectric

Nava Setter, Alexander Tagantsev, Marco Cantoni, Brahim Dkhil, Silviu Cosmin Sandu, Jin Wang, Tomas Sluka, Alexander Kvasov, Xiankui Wei

Ferroelectrics are widespread in technology(1), being used in electronics and communications(2), medical diagnostics and industrial automation. However, extension of their operational temperature range and useful properties is desired(3-5). Recent developm ...

Nature Publishing Group2015

Polaron response dominated multiferroic property in 12R-type hexagonal Ba(Ti1/3Mn2/3)O3-delta ceramics

Xiankui Wei

We report the multiferroic properties of 12R-type hexagonal Ba(Ti1/3Mn2/3)O3-delta found in Mn-doped BaTiO3 series samples. Hysteresis measurements reveal the coexistence of weak ferromagnetism and ferroelectricity at room temperature. Furthermore, frequen ...

Amer Inst Physics2015

Bent Ferroelectric Domain Walls as Reconfigurable Metallic-Like Channels

Nava Setter, Alexander Tagantsev, Enrico Colla, Igor Stolichnov, Tomas Sluka, Petr Yudin, Ludwig Feigl, Xiankui Wei, Arnaud Robert André Crassous, Konstantin Shapovalov

Use of ferroelectric domain-walls in future electronics requires that they are stable, rewritable conducting channels. Here we demonstrate nontherrnally activated metallic-like conduction in nominally uncharged, bent, rewritable ferroelectric-ferroelastic ...

Amer Chemical Soc2015

Polarity of translation boundaries in antiferroelectric PbZrO3

Nava Setter, Xiankui Wei

The polarity of translation boundaries (TBs) in antiferroelectric PbZrO3 is investigated. We show that previous experimentally reported polar property of RIII-1 type TB can be well approximated by a strain-free rigid model. Based on this, the modeling inve ...

Pergamon-Elsevier Science Ltd2015

Ferroelectric translational antiphase boundaries in nonpolar materials

Nava Setter, Alexander Tagantsev, Alexander Kvasov, Xiankui Wei

Ferroelectric materials are heavily used in electro-mechanics and electronics. Inside the ferroelectric, domain walls separate regions in which the spontaneous polarization is differently oriented. Properties of ferroelectric domain walls can differ from t ...

Nature Research2014

Controlled stripes of ultrafine ferroelectric domains

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Silviu Cosmin Sandu, Tomas Sluka, Mahamudu Mtebwa, Petr Yudin, Ludwig Feigl, Xiankui Wei, Konstantin Shapovalov

In the pursuit of ferroic-based (nano) electronics, it is essential to minutely control domain patterns and domain switching. The ability to control domain width, orientation and position is a prerequisite for circuitry based on fine domains. Here, we deve ...

Nature Publishing Group2014