Hgst Netherlands, B.v.

Hitachi Global Storage Technologies Netherlands B.v.

Yoshihiko Ooeda

Hiroyuki Matsumoto

Sukefumi Ito

Yoko Saito

Masayuki Ishikawa

Kenji Kuroki

Robert Waltman

Mina Amo

Katsuhide Tanaka

Yuichi Aoki

Yuzuru Shimazaki

A lubricant according to one embodiment includes a cyclophosphazene according to chemical formula 1, 

Lubricants providing magnetic head wear reduction and magnetic spacing improvement

In one embodiment, a magnetic recording medium includes a magnetic recording layer adapted to store magnetic information, a protective film positioned above the recording layer, the protective film being adapted to reduce wear to the magnetic recording layer, and a lubricant positioned above the protective film, the lubricant being adapted to provide a stable head-to-disk interface, wherein the lubricant includes a first lubricant, the first lubricant including a material having the following chemical formula: wherein Rf represents: and wherein Y is a repeating chain including carbon and fluorine.

Magnetic recording medium lubricant mixture and systems thereof

According to various embodiments, a lubricating layer for providing lubrication to a magnetic recording medium includes a perfluoropolyether (PFPE) represented by: X&#x2014;CFCFO(CFO)CFCF&#x2014;X, wherein m is in a range from 4 to 8 on average, and wherein X is This lubricating layer may be used in a magnetic disk, which includes a recording layer positioned above a nonmagnetic substrate, a protective film layer positioned above the recording layer, and the lubricating layer positioned above the protective film layer. In another embodiment, a method for forming a magnetic disk includes forming a recording layer above a nonmagnetic substrate, forming a protective film layer above the recording layer, and forming a lubricating layer above the protective film layer, the lubricating layer comprising a perfluoropolyether (PFPE) represented by: X&#x2014;CFCFO(CFO)CFCF&#x2014;X, wherein m is in a range from 4 to 8 on average, and wherein X is 

Magnetic media with a low molecular weight lubricating layer for use in head/media contact detection

In one embodiment, a magnetic disk medium includes a nonmagnetic substrate, a magnetic recording layer above the nonmagnetic substrate, a protective layer above the magnetic recording layer, and a lubricant layer above the protective layer, the lubricant layer including a mixture of a compound having one or more cyclophosphazene groups and a lubricant formulated R1-OCHCFCFO(CFCFCFO)CFCFCHO&#x2014;R2, wherein R1 and R2 are alkyl chains having at least two hydroxyl groups each, and m is an integer indicating a number of repeating units. According to another embodiment, a magnetic disk medium lubricant includes a mixture of a compound having one or more cyclophosphazene groups and a lubricant formulated as above, such that a magnetic head is provided stable flight above the lubricant layer in conditions having relative humidity of greater than about 40%.

Lubricant layer that provides a stable head-to-disk interface in humid conditions

A lubricant according to one embodiment includes a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.3, and said second ingredient being a second perfluoropolyether compound which has a weight-average molecular weight of 500 to 6000 and has 6 to 10 hydroxyl groups (on average) in one molecule,Rt-Rf-Rt &#x2003;&#x2003;(1) 

Lubricant suitable for use with magnetic disk

The head-slider is configured to receive an air-stream produced by rotation of a magnetic-recording disk and is configured to fly in proximity with a recording surface of the magnetic-recording disk. The head-slider includes a trailing edge on an outflow side of the air-stream, and a disk-facing surface that is configured to face the recording surface of the magnetic-recording disk. A low-surface-energy film is disposed on a portion of a trailing-edge side of the head-slider that is in contact with a boundary between the trailing edge and the disk-facing surface. The low-surface-energy film has a lower surface energy than other portions of the trailing-edge side where the low-surface-energy film is not disposed.

Head-slider including a low-surface-energy film that prevents lubricant accumulation, head-arm assembly including the head-slider, and hard-disk drive including the head-arm assembly

Embodiments of the present invention provide a magnetic disk having a lubricating layer formed on the surface thereof, which meets all the requirements for adhesiveness, adequate flowability, and strong binding power. In a particular embodiment, a magnetic disk has a magnetic layer, a protective layer, and a lubricating layer which are formed on a non-magnetic substrate, which is characterized in that said lubricating layer is comprised of a lubricant containing a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) below, which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.3, and said second ingredient being a second perfluoropolyether compound which has a weight-average molecular weight of 500 to 6000 and has 6 to 10 hydroxyl groups (on average) in one molecule,Rt-Rf-Rt&#x2003;&#x2003;(1)where, Rfdenotes a perfluoropolyether chain represented by the formula (2) and Rt denotes a terminal group represented by the formula (3),&#x2014;CFO&#x2014;[(CFCFO)&#x2014;(CFO)]&#x2014;CF&#x2014;&#x2003;&#x2003;(2)where, m and n each denote a natural number, 

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Yokohama, Japan

Yoshihiko Ooeda