Seminar
Key Laboratory of Inorganic Functional Material and Device, CAS
Shanghai Institute of Ceramics, Chinese Academy of Sciences

中国科学院无机功能材料与器件重点实验室 

Multifunctional Epitaxial Oxides

Speaker:  Prof. Dwight Viehland

Virginia Tech, Blacksburg, USA

时间：2012年06月06日（星期三）下午14:30

地点： 4 号楼 14楼第一会议室

联系人：罗豪甦

Abstract:

Multi-functional materials can respond to more than one external stimulus. Here, we will present advances in multiferroic epitaxial oxides prepared by laser deposition, self-assembling chemical methods, and polymer-assistance. We have achieved (i) giant magnetoelectricity in two-phase self-assembled CoFe₂O₄/BaTiO₃ thin layers grown on Pb(Mg_1/3Nb_2/3)O_3-x%PbTiO₃ single crystal substrates due to a domain rotation induced strain: with values of the magnetoelectric susceptibility approaching that of laminated ME composites; (ii) vertical integration of various two phase epitaxial oxides on wide band gap substrates, offering unique types of multifunctionality including semiconducting/piezoelectric amongst others; (iii) electrically and magnetically tunability of the magnetic anisotropy; and (iv) giant magnetoelectricity in heterostructural layers of piezoelectric PZT and ZnO epitaxially grown on magnetostrictive Metglas foils. The results offer an approach to a complete electromagnetic material, via different deposition methods: which could have important ramifications in sensors, voltage reading of spin states, power electronics, antennas, and memristors/gyrators.