Anisotropy, band-to-band transitions, phonon modes, and oxidation properties of cobalt-oxide core-shell slanted columnar thin films
Abstract
Highly ordered and spatially coherent cobalt slanted columnar thin films (SCTFs) were deposited by glancing angle deposition onto silicon substrates, and subsequently oxidized by annealing at 475 °C. Scanning electron microscopy, Raman scattering, generalized ellipsometry, and density functional theory investigations reveal shape-invariant transformation of the slanted nanocolumns from metallic to transparent metal-oxide core-shell structures with properties characteristic of spinel cobalt oxide. We find passivation of Co-SCTFs yielding Co-Al2O3 core-shell structures produced by conformal deposition of a few nanometers of alumina using atomic layer deposition fully prevents cobalt oxidation in ambient and from annealing up to 475 °C.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 01, 2016
- Source ID
- 10.1063/1.4941399
Entities
People
- Alexander Sinitskii
- Alyssa Mock
- Chad Briley
- Derek Sekora
- Eva Schubert
- Mathias Schubert
- Peter Wilson
- Rafał Korlacki
- Tino Hofmann
Organizations
- Army Research Office
- Linköping University
- National Science Foundation
- Swedish Governmental Agency for Innovation Systems
- University of Nebraska–Lincoln