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Effects of annealing and conformal alumina passivation on anisotropy and hysteresis of magneto-optical properties of cobalt slanted columnar thin films
University of Nebraska, NE 68588 USA.
University of Nebraska, NE 68588 USA.
University of Nebraska, NE 68588 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. University of Nebraska, NE 68588 USA.
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2017 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 421, 320-324 p.Article in journal (Refereed) Published
Abstract [en]

We present magneto-optical dielectric tensor data of cobalt and cobalt oxide slanted columnar thin films obtained by vector magneto-optical generalized ellipsometry. Room-temperature hysteresis magnetization measurements were performed in longitudinal and polar Kerr geometries on samples prior to and after a heat treatment process with and without a conformal Al2O3 passivation coating. The samples have been characterized by generalized ellipsometry, scanning electron microscopy, and Raman spectroscopy in conjuncture with density functional theory. We observe strongly anisotropic hysteresis behaviors, which depend on the nanocolumn and magnetizing field orientations. We find that deposited cobalt films that have been exposed to heat treatment and subsequent atmospheric oxidation into Co3O4, when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties (C) 2016 Published by Elsevier B.V.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 421, 320-324 p.
Keyword [en]
Vector magneto-optical generalized ellipsometry; Anisotropic magnetic hysteresis; Slanted columnar thin films; Atomic layer deposition; Heat treatment
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-141106DOI: 10.1016/j.apsusc.2016.12.198ISI: 000408756700010OAI: oai:DiVA.org:liu-141106DiVA: diva2:1144797
Note

Funding Agencies|National Science Foundation in RII [EPS-1004094]; National Science Foundation in CAREER [ECCS-0846329]; National Science Foundation in MRSEC [DMR-1420645]; Swedish Agency for Innovation Systems [2014-04712]; University of Nebraska-Lincoln

Available from: 2017-09-27 Created: 2017-09-27 Last updated: 2017-09-27

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
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