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Optical and structural properties of cobalt-permalloy slanted columnar heterostructure thin films

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Abstract Optical and structural properties of sequential Co-column–NiFe-column slanted columnar heterostructure thin films with an Al 2 O 3 passivation coating are reported. Electron-beam evaporated glancing angle deposition is utilized… Click to show full abstract

Abstract Optical and structural properties of sequential Co-column–NiFe-column slanted columnar heterostructure thin films with an Al 2 O 3 passivation coating are reported. Electron-beam evaporated glancing angle deposition is utilized to deposit the sequential multiple-material slanted columnar heterostructure thin films. Mueller matrix generalized spectroscopic ellipsometry data is analyzed with a best-match model approach employing the anisotropic Bruggeman effective medium approximation formalism to determine bulk-like and anisotropic optical and structural properties of the individual Co and NiFe slanted columnar material sub-layers. Scanning electron microscopy is applied to image the Co-NiFe sequential growth properties and to verify the results of the ellipsometric analysis. Comparisons to single-material slanted columnar thin films and optically bulk solid thin films are presented and discussed. We find that the optical and structural properties of each material sub-layer of the sequential slanted columnar heterostructure film are distinct from each other and resemble those of their respective single-material counterparts.

Keywords: thin films; structural properties; columnar heterostructure; slanted columnar; optical structural

Journal Title: Applied Surface Science
Year Published: 2017

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