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Fractal Nature of Metallic and Insulating Domain Configurations in a VO2 Thin Film Revealed by Kelvin Probe Force Microscopy

Title
Fractal Nature of Metallic and Insulating Domain Configurations in a VO2 Thin Film Revealed by Kelvin Probe Force Microscopy
Authors
Sohn, AhrumKanki, TeruoSakai, KotaroTanaka, HidekazuKim, Dong-Wook
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2015
Journal Title
SCIENTIFIC REPORTS
ISSN
2045-2322JCR Link
Citation
vol. 5
Publisher
NATURE PUBLISHING GROUP
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We investigated the surface work function (W-S) and its spatial distribution for epitaxial VO2/TiO2 thin films using Kelvin probe force microscopy (KPFM). Nearly grain-boundary-free samples allowed observation of metallic and insulating domains with distinct W-S values, throughout the metal-insulator transition. The metallic fraction, estimated from W-S maps, describes the evolution of the resistance based on a two-dimensional percolation model. The KPFM measurements also revealed the fractal nature of the domain configuration.
DOI
10.1038/srep10417
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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