Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films

The diffusion of oxidized cobalt metal (CoOx) through a sputtered amorphous carbon film is investigated as a function of carbon film thickness and of temperature in dry air. A kinetic model is developed using the experimental data. The kinetic model is based on Fickian diffusion and includes modific...

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Autor principal:	Robert J. Waltman
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	carbon overcoat film thermooxidation hard disk drives kinetics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2245b4b64cea4b33a30b85889300320d
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id	oai:doaj.org-article:2245b4b64cea4b33a30b85889300320d
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spelling	oai:doaj.org-article:2245b4b64cea4b33a30b85889300320d2021-11-05T09:18:04ZCobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films1881-219810.2474/trol.14.41https://doaj.org/article/2245b4b64cea4b33a30b85889300320d2019-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/2/14_41/_pdf/-char/enhttps://doaj.org/toc/1881-2198The diffusion of oxidized cobalt metal (CoOx) through a sputtered amorphous carbon film is investigated as a function of carbon film thickness and of temperature in dry air. A kinetic model is developed using the experimental data. The kinetic model is based on Fickian diffusion and includes modifications for carbon film porosity, tortuosity and for pore-clogging. The experimentally determined effective diffusion coefficient, Deff, increases with increasing temperature and decreasing carbon film thickness. However, the bulk diffusion coefficient D is independent of carbon film thickness whilst strongly dependent on temperature. The diffusibility Deff /D is thus a strong function of COC film thickness but is independent of temperature, indicative that the structure of the COC film is the significant determinant. An Arrhenius treatment yields an activation energy of 19 kcal/mol. The fitting parameters required to simulate the CoOx diffusion kinetics is tabulated. CoOx diffusion is modelled at 60°C as a function of carbon film thickness.Robert J. WaltmanJapanese Society of Tribologistsarticlecarbon overcoat filmthermooxidationhard disk driveskineticsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 2, Pp 41-52 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon overcoat film thermooxidation hard disk drives kinetics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	carbon overcoat film thermooxidation hard disk drives kinetics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Robert J. Waltman Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
description	The diffusion of oxidized cobalt metal (CoOx) through a sputtered amorphous carbon film is investigated as a function of carbon film thickness and of temperature in dry air. A kinetic model is developed using the experimental data. The kinetic model is based on Fickian diffusion and includes modifications for carbon film porosity, tortuosity and for pore-clogging. The experimentally determined effective diffusion coefficient, Deff, increases with increasing temperature and decreasing carbon film thickness. However, the bulk diffusion coefficient D is independent of carbon film thickness whilst strongly dependent on temperature. The diffusibility Deff /D is thus a strong function of COC film thickness but is independent of temperature, indicative that the structure of the COC film is the significant determinant. An Arrhenius treatment yields an activation energy of 19 kcal/mol. The fitting parameters required to simulate the CoOx diffusion kinetics is tabulated. CoOx diffusion is modelled at 60°C as a function of carbon film thickness.
format	article
author	Robert J. Waltman
author_facet	Robert J. Waltman
author_sort	Robert J. Waltman
title	Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
title_short	Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
title_full	Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
title_fullStr	Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
title_full_unstemmed	Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films
title_sort	cobalt oxide diffusion kinetics in ultra-thin amorphous carbon films
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/2245b4b64cea4b33a30b85889300320d
work_keys_str_mv	AT robertjwaltman cobaltoxidediffusionkineticsinultrathinamorphouscarbonfilms
_version_	1718444396285788160

Cobalt Oxide Diffusion Kinetics in Ultra-Thin Amorphous Carbon Films

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