Anisotropy, band-to-band transitions, phonon modes, and oxidation properties of cobalt-oxide core-shell slanted columnar thin films

Alyssa Mock, Rafał Korlacki, Chad Briley, Derek Sekora, Tino Hofmann, Peter Wilson, Alexander Sinitskii, Eva Schubert, Mathias Schubert

Research output: Contribution to journalArticle

10 Citations (Scopus)

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.

Original languageEnglish (US)
Article number051905
JournalApplied Physics Letters
Volume108
Issue number5
DOIs
StatePublished - Feb 1 2016

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cobalt oxides
cobalt
oxidation
anisotropy
annealing
thin films
atomic layer epitaxy
passivity
ellipsometry
spinel
metal oxides
aluminum oxides
Raman spectra
density functional theory
scanning electron microscopy
silicon

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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Anisotropy, band-to-band transitions, phonon modes, and oxidation properties of cobalt-oxide core-shell slanted columnar thin films. / Mock, Alyssa; Korlacki, Rafał; Briley, Chad; Sekora, Derek; Hofmann, Tino; Wilson, Peter; Sinitskii, Alexander; Schubert, Eva; Schubert, Mathias.

In: Applied Physics Letters, Vol. 108, No. 5, 051905, 01.02.2016.

Research output: Contribution to journalArticle

Mock, Alyssa ; Korlacki, Rafał ; Briley, Chad ; Sekora, Derek ; Hofmann, Tino ; Wilson, Peter ; Sinitskii, Alexander ; Schubert, Eva ; Schubert, Mathias. / Anisotropy, band-to-band transitions, phonon modes, and oxidation properties of cobalt-oxide core-shell slanted columnar thin films. In: Applied Physics Letters. 2016 ; Vol. 108, No. 5.
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