Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions

A heat-assisted magnetic recording (HAMR) is being implemented to increase the density of hard disks. However, adhesion of smear to the head slider is a drawback. We investigated a smear generation mechanism under laser irradiation in different environments (air and helium) using a disk coated with...

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Autores principales:	Kenji Yakata, Satoki Ichikawa, Hiroshi Tani, Renguo Lu, Shinji Koganezawa, Norio Tagawa
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	hamr laser environment gas smear pfpe hard disk tof-sims 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/60b9c5e73c2f4caeb8383a74af52d64d
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spelling	oai:doaj.org-article:60b9c5e73c2f4caeb8383a74af52d64d2021-11-05T09:10:34ZSmear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions1881-219810.2474/trol.15.186https://doaj.org/article/60b9c5e73c2f4caeb8383a74af52d64d2020-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/3/15_186/_pdf/-char/enhttps://doaj.org/toc/1881-2198A heat-assisted magnetic recording (HAMR) is being implemented to increase the density of hard disks. However, adhesion of smear to the head slider is a drawback. We investigated a smear generation mechanism under laser irradiation in different environments (air and helium) using a disk coated with perfluoropolyether lubricant D-4OH. The amount of smear was smaller in air than in helium at all temperatures. An analysis of smears at 258°C using time-of-flight secondary ion mass spectrometry (TOF-SIMS) suggested that the end group was oxidatively decomposed and the hydrocarbons were burned. And the differences in the end group/main chain ratio and the hydrocarbon ratio between the two environments were smaller at 540°C than at 258°C. It suggested that the lubricant molecules were thermally decomposed owing to the high temperature. It was observed that there was a small difference in the smear amounts between the two environmental gases at 540°C due to the thermal decomposition of the lubricants, but the presence of oxygen was effective in reducing the amount of smear when the heating temperature was 200–300°C.Kenji YakataSatoki IchikawaHiroshi TaniRenguo LuShinji KoganezawaNorio TagawaJapanese Society of Tribologistsarticlehamrlaserenvironment gassmearpfpehard disktof-simsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 3, Pp 186-193 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	hamr laser environment gas smear pfpe hard disk tof-sims Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	hamr laser environment gas smear pfpe hard disk tof-sims Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kenji Yakata Satoki Ichikawa Hiroshi Tani Renguo Lu Shinji Koganezawa Norio Tagawa Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
description	A heat-assisted magnetic recording (HAMR) is being implemented to increase the density of hard disks. However, adhesion of smear to the head slider is a drawback. We investigated a smear generation mechanism under laser irradiation in different environments (air and helium) using a disk coated with perfluoropolyether lubricant D-4OH. The amount of smear was smaller in air than in helium at all temperatures. An analysis of smears at 258°C using time-of-flight secondary ion mass spectrometry (TOF-SIMS) suggested that the end group was oxidatively decomposed and the hydrocarbons were burned. And the differences in the end group/main chain ratio and the hydrocarbon ratio between the two environments were smaller at 540°C than at 258°C. It suggested that the lubricant molecules were thermally decomposed owing to the high temperature. It was observed that there was a small difference in the smear amounts between the two environmental gases at 540°C due to the thermal decomposition of the lubricants, but the presence of oxygen was effective in reducing the amount of smear when the heating temperature was 200–300°C.
format	article
author	Kenji Yakata Satoki Ichikawa Hiroshi Tani Renguo Lu Shinji Koganezawa Norio Tagawa
author_facet	Kenji Yakata Satoki Ichikawa Hiroshi Tani Renguo Lu Shinji Koganezawa Norio Tagawa
author_sort	Kenji Yakata
title	Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
title_short	Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
title_full	Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
title_fullStr	Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
title_full_unstemmed	Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions
title_sort	smear and decomposition mechanism of magnetic disk pfpe lubricant film by laser heating in air and helium conditions
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/60b9c5e73c2f4caeb8383a74af52d64d
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Smear and Decomposition Mechanism of Magnetic Disk PFPE Lubricant Film by Laser Heating in Air and Helium Conditions

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