Семинар профессора Бориса Стурмана!


23 мая в 15-00 в УЦКП «Современные нанотехнологии» состоялся  семинар профессора Бориса Стурмана из Института Автоматики и Электрометрии СО РАН, Новосибирск.


Переключение сегнетоэлектрических доменов с учетом компенсации заряда: роль проводимости доменных стенок.

Б. Стурман, Е. Подивилов

Ferroelectric Domain Reversal with Charge Compensation: The Role of Domain Wall Conduction 

B. Sturman, E. Podivilov 

Institute of Automation and Electrometry, Russian Academy of Sciences, 630090 Novosibirsk, Russia 

Ferroelectric domain reversal is a vast research area relevant to the fundamental studies and applications as well as to macro and nano scales. An instantaneous compensation of typically huge depolarizing electric fields is a key element here. On the other hand, the domain wall (DW) conduction, predicted more than 50 years ago, came true recently on a large scale. Being often separated by big surface energy barriers in macroscopic experiments, the DW conduction becomes much easily available under the conditions of atomic-force microscopy (AFM). We claim that the DW conduction has to be regarded as a crucial and general ingredient of the domain reversal processes. Its importance is in providing an automatic compensation of the depolarizing electric fields. The presence of DW conduction essentially modifies the basics of domain reversal processes, including the relations for domain formation energies, the domain grows velocities, and the shapes of domain nucleus. Concerning AFM applications, domain reversal theories have to include models of charge injection from tip electrodes. We provide specific primary results relevant to the basics of DW conduction mediated ferroelectric domain reversal. 

25 May 2022