A Three Component Self-Assembled Epitaxial Nanocomposite Thin Film

TitleA Three Component Self-Assembled Epitaxial Nanocomposite Thin Film
Publication TypeJournal Article
Year of Publication2015
AuthorsKim, DHun, Sun, XYin, Aimon, NM, Kim, JJin, Campion, MJ, Tuller, HL, Kornblum, L, Walker, FJ, Ahn, CH, Ross, CA
JournalAdvanced Functional Materials
Volume25
Issue20
Pagination3091 - 3100
Date Published2015/05/27/
Abstract

A self-assembled three phase epitaxial nanocomposite film is grown consisting of approximate to 3 nm diameter fcc metallic Cu nanorods within square prismatic SrO rocksalt nanopillars in a Sr(Ti,Cu)O3- perovskite matrix. Each phase has an epitaxial relation to the others. The core-shell-matrix structures are grown on SrTiO3 substrates and can also be integrated onto Si using a thin SrTiO3 buffer. The structure is made by pulsed laser deposition in vacuum from a SrTi0.75Cu0.25O3 target, and formed as a result of the limited solubility of Cu in the perovskite matrix. Wet etching removes the 3 nm diameter Cu nanowires leaving porous SrO pillars. The three-phase nanocomposite film is used as a substrate for growing a second epitaxial nanocomposite consisting of CoFe2O4 spinel pillars in a BiFeO3 perovskite matrix, producing dramatic effects on the structure and magnetic properties of the CoFe2O4. This three-phase vertical nanocomposite provides a complement to the well-known two-phase nanocomposites, and may offer a combination of properties of three different materials as well as additional avenues for strain-mediated coupling within a single film.