Fall 2020 Physics Colloquium: Electrolyte-Controlled Magnetism

Dr. Chris Leighton, University of Minnesota

When

3 – 4 p.m., Nov. 19, 2020

Where

Abstract: Recently, novel techniques have been developed where interfaces between solids and electrolytes (i.e., systems with dissolved, mobile ions), enable electrical induction of massive densities of charge carriers. These densities correspond to sizable fractions of an electron per unit cell in most materials, realizing electrical control over electronic phase transitions. In this talk I will give an overview of this technique, called “electrolyte gating”, before summarizing our results clarifying the mechanisms, capabilities, and applications of this approach, focusing on electrical control of magnetism [1-7]. The latter is important for technology, because it could enable new data storage and processing paradigms, critically, at low power consumption. Highlights will include understanding electrostatic vs. electrochemical gating mechanisms [1-3,6], modulation of magnetic ordering temperatures over record windows [1-6], and, using Fool’s Gold as a model system, voltage-induced ferromagnetism in even non-magnetic materials [7].

Zoom Link: https://arizona.zoom.us/j/85856505689

Zoom Password: 700197