MRS Meetings and Events

 

EL06.08.04 2024 MRS Spring Meeting

Polar Vortices at mmWave Frequencies

When and Where

Apr 25, 2024
2:45pm - 3:00pm

Room 343, Level 3, Summit

Presenter

Co-Author(s)

Florian Bergmann1,2,Peter Meisenheimer3,Bryan Bosworth1,Nick Jungwirth1,Ramamoorthy Ramesh4,Nate Orloff1

National Institute of Standards and Technology1,University of Colorado Boulder2,University of California, Berkeley3,Rice University4

Abstract

Florian Bergmann1,2,Peter Meisenheimer3,Bryan Bosworth1,Nick Jungwirth1,Ramamoorthy Ramesh4,Nate Orloff1

National Institute of Standards and Technology1,University of Colorado Boulder2,University of California, Berkeley3,Rice University4
PbTiO<sub>3</sub>-SrTiO<sub>3</sub> superlattice films form Polar Vortices under the right lattice periodicity conditions. Experiments at kHz and THz frequencies have already shown emergent properties of these superlattice films like negative permittivity and collective lattice dynamics. However, data in the GHz range are sparse. Measurements in this frequency range are both interesting for the fundamental understanding of Polar Vortices and for potential electronic applications of the films. Here, we report on broadband measurements from 70 kHz to 110 GHz using Coplanar Waveguide devices. We extract the permittivity of a PbTiO<sub>3</sub>-SrTiO<sub>3</sub> superlattice film on a DyScO<sub>3</sub> substrate and compare the results to those from co-fabricated PbTiO<sub>3</sub> and SrTiO<sub>3</sub> films. For all samples, we characterize the complex in-plane permittivity in two perpendicular orientations and as a function of bias voltage. Based on our results, we discuss the potential of Polar Vortex films for mmWave applications.

Keywords

microstructure

Symposium Organizers

Aiping Chen, Los Alamos National Laboratory
Woo Seok Choi, Sungkyunkwan University
Marta Gibert, Technische Universität Wien
Megan Holtz, Colorado School of Mines

Symposium Support

Silver
Korea Vacuum Tech, Ltd.

Bronze
Center for Integrated Nanotechnologies, Los Alamos National Laboratory
Radiant Technologies, Inc.

Publishing Alliance

MRS publishes with Springer Nature