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Flash Sintering of Ceramics: A Short Review Read chapter Read first chapter

2017 | OriginalPaper | Chapter

Reducing Losses in Magnetic Thin Films Through Nanoscale Surface Patterning

Authors : Goran Rasic, Branislav Vlahovic, Justin Schwartz

Published in: Proceedings of the IV Advanced Ceramics and Applications Conference

Publisher: Atlantis Press

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Abstract

Biaxially textured nickel ferrite (NFO) thin films were grown by chemical solution deposition on c-plane sapphire substrates. Crystal structure and chemical composition was evaluated using X-ray Diffraction (XRD). Nanoimprint lithography (NIL) technique using a polydimethylsiloxane (PDMS) stamp was used imprint the films. A method for large scale precise patterning of was demonstrated. Quality of the transferred pattern was evaluated using atomic force (AFM) and transmission electron microscopies (TEM). Magnetic measurements were performed using superconducting quantum interference device (SQUID) and showed large decrease of coercivity in patterned samples. Probable causes for coercivity reduction have been investigated and surface patterning has been shown to be the direct cause of the coercivity reduction phenomena. Coercivity reduction has been shown to translate to thicker films with layer-by-layer manufacturing method yielding better results. The effect of changing the surface pattern on the topography, crystallography and magnetic properties was investigated and different trends were observed for the measurements done with the magnetic field parallel and perpendicular to the film surface. In all cases, the coercivity was reduced relative to the planar (nonpatterned) films and relative to the base layer onto which the patterned film was deposited. All films showed a similar magnetic response as indicated by similarities in the curve shape. Crystallography measurements showed the imprint process did not affect the grain growth and orientation regardless of the surface feature size as indicated by all films having virtually identical diffraction patterns. The lower limit of surface patterning here was shown to be around 500 nm. Below 750 nm, the pattern quality degraded and the feature height reduced. The domain configurations of the planar and patterned films were investigated. Deviation from the expected domain configuration was found in the patterned films. The origin of the observed domain structure and coercivity reduction has been shown to be the surface topography induced change in the minimum energy configuration of the sample. This results in the minimization of the total sample magnetization through formation of stripe domains.

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Metadata
Title
Reducing Losses in Magnetic Thin Films Through Nanoscale Surface Patterning
Authors
Goran Rasic
Branislav Vlahovic
Justin Schwartz
Copyright Year
2017
Publisher
Atlantis Press
Book
Proceedings of the IV Advanced Ceramics and Applications Conference

Print ISBN: 978-94-6239-212-0

Electronic ISBN: 978-94-6239-213-7

Copyright Year: 2017

DOI
https://doi.org/10.2991/978-94-6239-213-7_4

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