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公开(公告)号：US09449634B2
公开(公告)日：2016-09-20
申请号：US14810611
申请日：2015-07-28
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko Okabe , Katsuaki To
CPC classification number: G11B5/8408 , G11B5/85
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant on the stacked body after depositing the first lubricant, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere. The first lubricant has a lower molecular mass and a higher chemical polarity than those of the second lubricant.
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公开(公告)号：US09177587B2
公开(公告)日：2015-11-03
申请号：US14148931
申请日：2014-01-07
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko Okabe , Katsuaki To
IPC: G11B5/84
CPC classification number: G11B5/8408
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant on the stacked body after depositing the first lubricant, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere.
Abstract translation: 通过在层叠体上依次形成磁记录层，保护层和润滑层来制造磁记录介质的方法包括：在形成保护层之后，通过蒸镀形成保护层，在第一润滑剂上形成润滑剂 在不将层叠体暴露在大气中的同时润滑沉积，以及在沉积第一种润滑剂之后，通过气相润滑沉积而在层叠体上沉积第二种润滑剂，而不将堆叠体暴露在大气中。
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公开(公告)号：US10984829B2
公开(公告)日：2021-04-20
申请号：US16279143
申请日：2019-02-19
Applicant: SHOWA DENKO K.K.
Inventor： Kota Hasegawa , Katsuaki To
Abstract: A magnetic recording medium includes a nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protection layer that are arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer that are arranged in this order on the orientation control layer. The first magnetic layer has a granular structure including an oxide at grain boundary parts of magnetic grains, and the second magnetic layer is closest to the protection layer among layers within the perpendicular magnetic layer, and includes magnetic grains made of a CoCrPt alloy, and a nitride of carbon or a hydride of carbon.
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公开(公告)号：US11295775B2
公开(公告)日：2022-04-05
申请号：US16953894
申请日：2020-11-20
Applicant: SHOWA DENKO K.K.
Inventor： Kota Hasegawa , Katsuaki To
Abstract: A magnetic recording medium includes a nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protection layer that are arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer that are arranged in this order on the orientation control layer. The first magnetic layer has a granular structure including an oxide at grain boundary parts of magnetic grains, and the second magnetic layer is closest to the protection layer among layers within the perpendicular magnetic layer, and includes magnetic grains made of a CoCrPt alloy, and a nitride of carbon or a hydride of carbon.
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Patent Agency Ranking
公开(公告)号：US09147422B2
公开(公告)日：2015-09-29
申请号：US14217637
申请日：2014-03-18
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko Okabe , Katsuaki To
CPC classification number: G11B5/8408 , G11B5/85
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant on the stacked body after depositing the first lubricant, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere. The first lubricant has a lower molecular mass and a higher chemical polarity than those of the second lubricant.
Abstract translation: 通过在层叠体上依次形成磁记录层，保护层和润滑层来制造磁记录介质的方法包括：在形成保护层之后，通过蒸镀形成保护层，在第一润滑剂上形成润滑剂 在不将层叠体暴露在大气中的同时润滑沉积，以及在沉积第一种润滑剂之后，通过气相润滑沉积而在层叠体上沉积第二种润滑剂，而不将堆叠体暴露在大气中。 第一润滑剂具有比第二润滑剂低的分子量和更高的化学极性。
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公开(公告)号：US10074396B2
公开(公告)日：2018-09-11
申请号：US15264988
申请日：2016-09-14
Applicant: SHOWA DENKO K.K.
Inventor： Eishin Yamakawa , Katsuaki To , Saeko Hayase
CPC classification number: G11B19/28 , G11B5/72 , G11B5/725 , G11B21/106
Abstract: In a magnetic recording medium of the present invention, an outermost surface of a protective layer 3 on a lubricant layer 4 side contains carbon and nitrogen in a range of 50 atomic % to 90 atomic %, and the lubricant layer 4 is formed by being in contact with the outermost surface, contains compounds A to C represented in the below general formulas (1) to (3) described below, and has a film thickness of 0.5 nm to 2 nm. R1-C6H4OCH2CH(OH)CH2OCH2—R2-CH2OCH2CH(OH)CH2OH (1), CH2(OH)CH(OH)CH2OCH2CF2CF2(OCF2CF2CF2)mOCF2CF2CH2OCH2CH(OH)CH2OH (2), HOCH2CF2CF2O(CF2CF2CF2O)sCF2CF2CH2OCH2CH(OH)CH2OH (3)
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公开(公告)号：US09159354B2
公开(公告)日：2015-10-13
申请号：US14154244
申请日：2014-01-14
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko Okabe , Katsuaki To
IPC: G11B5/84
CPC classification number: G11B5/8408
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant that is dissolved in an organic solvent onto the stacked body after depositing the first lubricant.
Abstract translation: 通过在层叠体上依次形成磁记录层，保护层和润滑层来制造磁记录介质的方法包括：在形成保护层之后，通过蒸镀形成保护层，在第一润滑剂上形成润滑剂 在不使层叠体暴露于大气的同时润滑沉积，以及在沉积第一润滑剂之后将溶解在有机溶剂中的第二润滑剂沉积到层叠体上。
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公开(公告)号：US20140295073A1
公开(公告)日：2014-10-02
申请号：US14217637
申请日：2014-03-18
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko OKABE , Katsuaki To
CPC classification number: G11B5/8408 , G11B5/85
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant on the stacked body after depositing the first lubricant, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere. The first lubricant has a lower molecular mass and a higher chemical polarity than those of the second lubricant.
Abstract translation: 通过在层叠体上依次形成磁记录层，保护层和润滑层来制造磁记录介质的方法包括：在形成保护层之后，通过蒸镀形成保护层，在第一润滑剂上形成润滑剂 在不将层叠体暴露在大气中的同时润滑沉积，以及在沉积第一种润滑剂之后，通过气相润滑沉积而在层叠体上沉积第二种润滑剂，而不将堆叠体暴露在大气中。 第一润滑剂具有比第二润滑剂低的分子量和更高的化学极性。
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公开(公告)号：US20140212579A1
公开(公告)日：2014-07-31
申请号：US14154244
申请日：2014-01-14
Applicant: SHOWA DENKO K.K.
Inventor： Takehiko OKABE , Katsuaki To
IPC: G11B5/84
CPC classification number: G11B5/8408
Abstract: A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, includes forming the lubricant by depositing a first lubricant on the stacked body after forming the protection layer, by vapor-phase lubrication deposition, without exposing the stacked body to atmosphere, and depositing a second lubricant that is dissolved in an organic solvent onto the stacked body after depositing the first lubricant.
Abstract translation: 通过在层叠体上依次形成磁记录层，保护层和润滑层来制造磁记录介质的方法包括：在形成保护层之后，通过蒸镀形成保护层，在第一润滑剂上形成润滑剂 在不使层叠体暴露于大气的同时润滑沉积，以及在沉积第一润滑剂之后将溶解在有机溶剂中的第二润滑剂沉积到堆叠体上。
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