Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives

In order to attain high recording density in a hard disk drive, reduction of the head-media spacing (HMS) is crucial. The contribution of lubricant thickness to the HMS is a significant factor in performance. Because the lubricant thickness is on the order of angstroms, molecules of long-chain lubri...

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Autores principales:	Kouki Hatsuda, Nobuo Tano, Hiroshi Tani
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	adhesion force ionic liquid microtribology molecular conformation monolayer thickness 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/e416ba978a844974b9dc3cd56bba001c
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id	oai:doaj.org-article:e416ba978a844974b9dc3cd56bba001c
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spelling	oai:doaj.org-article:e416ba978a844974b9dc3cd56bba001c2021-11-05T09:08:00ZIonic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives1881-219810.2474/trol.15.230https://doaj.org/article/e416ba978a844974b9dc3cd56bba001c2020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/4/15_230/_pdf/-char/enhttps://doaj.org/toc/1881-2198In order to attain high recording density in a hard disk drive, reduction of the head-media spacing (HMS) is crucial. The contribution of lubricant thickness to the HMS is a significant factor in performance. Because the lubricant thickness is on the order of angstroms, molecules of long-chain lubricants, such as perfluoroether, must lay parallel to the magnetic disk surface to reduce lubricant thickness. In this study, new lubricants were designed using ionic liquids (ILs). The ILs had smaller molecular weight than that of current perfluoropolyether (PFPE) lubricants but with lower evaporation loss. The molecular conformation of the ILs was controlled by two hydroxyl groups, which were placed in a cation moiety at both terminal ends (IL-1) or placed on one side of the cation (IL-2). The monolayer thickness of IL-1 and IL-2 was seen to be 0.6 nm and 1.2 nm, respectively. The adhesion force at a lubricant thickness of 1.0 nm decreased in the order: PFPE (Z-Dol 2000) > IL-2 > IL-1. The small adhesion force, which is one of the essential parameters for low flight of a magnetic head, was achieved by changing the molecular conformation of the IL.Kouki HatsudaNobuo TanoHiroshi TaniJapanese Society of Tribologistsarticleadhesion forceionic liquidmicrotribologymolecular conformationmonolayer thicknessPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 4, Pp 230-240 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	adhesion force ionic liquid microtribology molecular conformation monolayer thickness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	adhesion force ionic liquid microtribology molecular conformation monolayer thickness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kouki Hatsuda Nobuo Tano Hiroshi Tani Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
description	In order to attain high recording density in a hard disk drive, reduction of the head-media spacing (HMS) is crucial. The contribution of lubricant thickness to the HMS is a significant factor in performance. Because the lubricant thickness is on the order of angstroms, molecules of long-chain lubricants, such as perfluoroether, must lay parallel to the magnetic disk surface to reduce lubricant thickness. In this study, new lubricants were designed using ionic liquids (ILs). The ILs had smaller molecular weight than that of current perfluoropolyether (PFPE) lubricants but with lower evaporation loss. The molecular conformation of the ILs was controlled by two hydroxyl groups, which were placed in a cation moiety at both terminal ends (IL-1) or placed on one side of the cation (IL-2). The monolayer thickness of IL-1 and IL-2 was seen to be 0.6 nm and 1.2 nm, respectively. The adhesion force at a lubricant thickness of 1.0 nm decreased in the order: PFPE (Z-Dol 2000) > IL-2 > IL-1. The small adhesion force, which is one of the essential parameters for low flight of a magnetic head, was achieved by changing the molecular conformation of the IL.
format	article
author	Kouki Hatsuda Nobuo Tano Hiroshi Tani
author_facet	Kouki Hatsuda Nobuo Tano Hiroshi Tani
author_sort	Kouki Hatsuda
title	Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
title_short	Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
title_full	Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
title_fullStr	Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
title_full_unstemmed	Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives
title_sort	ionic liquid lubricant for ultra-low head-media spacing in hard disk drives
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/e416ba978a844974b9dc3cd56bba001c
work_keys_str_mv	AT koukihatsuda ionicliquidlubricantforultralowheadmediaspacinginharddiskdrives AT nobuotano ionicliquidlubricantforultralowheadmediaspacinginharddiskdrives AT hiroshitani ionicliquidlubricantforultralowheadmediaspacinginharddiskdrives
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Ionic Liquid Lubricant for Ultra-Low Head-Media Spacing in Hard Disk Drives

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