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ToF-SIMS study of carbon diffusion in Co-Pt-TiO2 composite and ruthenium films.

Authors
  • Wang, Jianhui
  • Zhang, Sam
Type
Published Article
Journal
Journal of Nanoscience and Nanotechnology
Publisher
American Scientific Publishers
Publication Date
Feb 01, 2010
Volume
10
Issue
2
Pages
770–774
Identifiers
PMID: 20352716
Source
Medline
License
Unknown

Abstract

In this paper, the diffusion behavior of hydrogenated amorphous carbon into Co-Pt-TiO2 and Ruthenium films was first investigated. Impact of carbon on Co-Pt-TiO2 composite film and its diffusion in Co-Pt-TiO2 and ruthenium films were studied using Time-of-Flight Secondary Ion Mass Spectroscopy. Magnetic coercivity drop was observed for Co-Pt-TiO2 films coated with ruthenium and carbon hybrid overcoat at varied thickness ratio. Co-Pt-TiO2 film is widely used in perpendicular magnetic recording. Carbon depth profile showed that carbon readily diffuses in Co-Pt-TiO2 film because of its porous structure. However, carbon diffusion in ruthenium film is limited even annealing up to 200 degrees C in argon. Carbon's diffusion length and coefficient in Co-Pt-TiO2 are much higher than that in Ru film. The activation energy was calculated for both cases.

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