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 language | English (US) |
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Pages (from-to) | 320-324 |
Number of pages | 5 |
Journal | Applied Surface Science |
Volume | 421 |
DOIs | |
State | Published - Nov 1 2017 |
Keywords
- Anisotropic magnetic hysteresis
- Atomic layer deposition
- Heat treatment
- Slanted columnar thin films
- Vector magneto-optical generalized ellipsometry
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films