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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.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten. University of Nebraska, NE 68588 USA.
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2017 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 421, s. 320-324Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE BV , 2017. Vol. 421, s. 320-324
Nyckelord [en]
Vector magneto-optical generalized ellipsometry; Anisotropic magnetic hysteresis; Slanted columnar thin films; Atomic layer deposition; Heat treatment
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URN: urn:nbn:se:liu:diva-141106DOI: 10.1016/j.apsusc.2016.12.198ISI: 000408756700010OAI: oai:DiVA.org:liu-141106DiVA, id: diva2:1144797
Anmärkning

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

Tillgänglig från: 2017-09-27 Skapad: 2017-09-27 Senast uppdaterad: 2022-09-05

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Schubert, Mathias

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