Effects of annealing and conformal alumina passivation on anisotropy and hysteresis of magneto-optical properties of cobalt slanted columnar thin films

Chad Briley, Alyssa Mock, Rafał Korlacki, Tino Hofmann, Eva Schubert, Mathias Schubert

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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 Al 2 O 3 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 Co 3 O 4 , when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties.

Original languageEnglish (US)
Pages (from-to)320-324
Number of pages5
JournalApplied Surface Science
Volume421
DOIs
StatePublished - Nov 1 2017

Fingerprint

Aluminum Oxide
Cobalt
Passivation
passivity
Hysteresis
Anisotropy
Alumina
cobalt
Optical properties
aluminum oxides
hysteresis
Ellipsometry
Annealing
optical properties
Thin films
anisotropy
ellipsometry
annealing
heat treatment
thin films

Keywords

  • Anisotropic magnetic hysteresis
  • Atomic layer deposition
  • Heat treatment
  • Slanted columnar thin films
  • Vector magneto-optical generalized ellipsometry

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Effects of annealing and conformal alumina passivation on anisotropy and hysteresis of magneto-optical properties of cobalt slanted columnar thin films. / Briley, Chad; Mock, Alyssa; Korlacki, Rafał; Hofmann, Tino; Schubert, Eva; Schubert, Mathias.

In: Applied Surface Science, Vol. 421, 01.11.2017, p. 320-324.

Research output: Contribution to journalArticle

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AU - Briley, Chad

AU - Mock, Alyssa

AU - Korlacki, Rafał

AU - Hofmann, Tino

AU - Schubert, Eva

AU - Schubert, Mathias

PY - 2017/11/1

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N2 - 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 Al 2 O 3 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 Co 3 O 4 , when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties.

AB - 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 Al 2 O 3 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 Co 3 O 4 , when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties.

KW - Anisotropic magnetic hysteresis

KW - Atomic layer deposition

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KW - Vector magneto-optical generalized ellipsometry

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