Nanostructure, structural stability, and diffusion characteristics of layered coatings for heat-assisted magnetic recording head media
Autor: | J. Matlak, Kyriakos Komvopoulos, Ehsan Rismani-Yazdi |
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Rok vydání: | 2018 |
Předmět: |
Materials science
lcsh:Medicine 02 engineering and technology engineering.material 01 natural sciences Article Coating 0103 physical sciences Scanning transmission electron microscopy Composite material lcsh:Science High-resolution transmission electron microscopy 010302 applied physics Multidisciplinary Electron energy loss spectroscopy lcsh:R 021001 nanoscience & nanotechnology Other Physical Sciences Amorphous carbon Heat-assisted magnetic recording Transmission electron microscopy engineering lcsh:Q Biochemistry and Cell Biology 0210 nano-technology Layer (electronics) |
Zdroj: | Scientific reports, vol 8, iss 1 Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-15 (2018) Matlak, J; Rismaniyazdi, E; & Komvopoulos, K. (2018). Nanostructure, structural stability, and diffusion characteristics of layered coatings for heat-assisted magnetic recording head media. Scientific Reports, 8(1). doi: 10.1038/s41598-018-27688-4. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/5kc1d1k8 |
Popis: | The intense laser heating in heat-assisted magnetic recording (HAMR) has been a major hindrance to HAMR technology from becoming commercially viable. Thermal damage of the near-field transducer (NFT) and write pole (WP) embedded in the trailing edge of the magnetic head due to failure of the protective carbon overcoat after prolonged heating at an elevated temperature are major obstacles. Therefore, the main objective of this study was to develop an effective coating method for HAMR heads. This was accomplished by introducing a new class of layered coatings consisting of ultrathin amorphous carbon (a-C) overcoat, adhesion (SiN) layer, and buffer (NiCr or TaOx) layer sequentially deposited onto Au and FeCo base layers to mimic the layer stacking of NFT and WP elements, respectively. The structural stability of the a-C overcoats and diffusion characteristics of each comprising layer under conditions of heating at 350 °C for 30 min in an Ar atmosphere were investigated by high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), and electron energy loss spectroscopy (EELS). For most stacking configurations the HRTEM/STEM and EELS results generally revealed some layer intermixing and minute carbon atom rehybridization in the heated a-C overcoats. The findings of this investigation suggest that further optimization of the developed layered coatings can provide a viable solution to thermal damage of HAMR heads. |
Databáze: | OpenAIRE |
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