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Thursday, January 24

Local Probing of Coupling between Physical and Ionic Behaviors

Yunseok Kim, Sungkyunkwan University, Seoul, South Korea
Materials Science and Technology Division Seminar
11:00 AM — 12:00 PM, Chemical and Material Sciences Building (4100), Room J-302
Contact: Ho Nyung Lee (hnlee@ornl.gov), 865.574.9782

Abstract

Transition metal oxides are explored as a treasure trove of novel device-oriented electronic functionalities ranging from interfacial electronic conductance and magnetoelectric coupling to superconductivity. Remarkably, materials used in physical applications such as ferroelectric titanates are electrochemically similar to the typical memristive TiO2 and SrTiO3 systems. These similarities naturally lead to question on what is the link between ferroic transitions and electrochemical responses at the surfaces and interfaces on transition metal oxides. On the other hand, hysteretic metal-insulator transitions (MIT) mediated by ionic dynamics or ferroic phase transitions underpin emergent applications for non-volatile memories and logic devices. Multiple classes of MIT are intrinsically coupled to strain and therefore will be affected by mechanical stimulus. In this presentation, I will present some examples of interplay between physical and ionic behavior in transition metal oxides, e.g., ionically mediated hysteresis loop in TiO2 and SrTiO3 and mechanically driven MIT in NiO, using scanning probe microscopy. I will further present multi-dimensional probing of physical properties.