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1. 发明申请

US20130286505A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 有权
标题翻译：磁记录介质和磁记忆装置
公开(公告)号：US20130286505A1
公开(公告)日：2013-10-31
申请号：US13799078
申请日：2013-03-13
申请人： HITACHI, LTD.
发明人： Hiroshi FUKUDA , Yoshihiro SHIROISHI
IPC分类号： G11B5/78
CPC分类号： G11B5/78 , G11B5/66 , G11B2005/0024
摘要： There are provided a magnetic recording medium and a magnetic memory device capable of implementing high recording density, in the case of using a microwave assisted magnetic recording (MAMR) scheme. In a magnetic memory device including a magnetic recording medium having a recording film with three or more layers, a recording magnetic pole generating a recording magnetic field, an opposed magnetic pole, a high frequency magnetic field generating element generating a microwave for recording assist, and a magnetic reproduction element, an anisotropic field of a first layer which is a top layer of the recording film is larger than 20 kOe.
摘要翻译：在使用微波辅助磁记录（MAMR）方案的情况下，提供了能够实现高记录密度的磁记录介质和磁存储装置。在包括具有三层或多层记录膜的磁记录介质的磁存储器件中，产生记录磁场的记录磁极，相对磁极，产生用于记录辅助的微波的高频磁场产生元件，以及磁性再现元件，作为记录膜的顶层的第一层的各向异性磁场大于20kOe。

2. 发明申请

US20140104724A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 审中-公开
标题翻译：全能磁记录介质和磁存储器件
公开(公告)号：US20140104724A1
公开(公告)日：2014-04-17
申请号：US14055012
申请日：2013-10-16
申请人： HITACHI. LTD.
发明人： Yoshihiro SHIROISHI , Yoshiyuki HIRAYAMA , Hiroshi FUKUDA , Yo SATO
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/66 , G11B5/7325 , G11B5/851
摘要： Provided are a magnetic recording medium suitable for use with a microwave assisted magnetic recording head and suitable for such recording and a method for manufacturing the same. A perpendicular magnetic recording medium includes a recording layer including a plurality of magnetic layers. A magnetic layer as an uppermost layer of the recording layer includes three or more of sub-layers each having thickness of more than 0 and 1 nm or less, the sub-layers including a first sub-layer and a second sub-layer to make up a lamination unit layer, the first sub-layer including, as a major element, 50% or more of at least one type of element selected from the group consisting of Co, Fe and Ni, the second sub-layer including, as a major element, an element different from the major element of the first sub-layer. The magnetic layer as the uppermost layer includes a plurality of lamination unit layers having different composition of sub-layers at least one sub-layer among the lamination unit layers and/or a different film thickness of sub-layers at least one sub-layer among the lamination unit layers.
摘要翻译：提供一种适用于微波辅助磁记录头并适用于这种记录的磁记录介质及其制造方法。垂直磁记录介质包括包含多个磁性层的记录层。作为记录层的最上层的磁性层包括三个以上的各自具有大于0和1nm或更小的厚度的子层，子层包括第一子层和第二子层，以形成层叠单元层，第一子层作为主要元素包含选自Co，Fe和Ni中的至少一种类型的元素的50％以上，第二子层包含作为主要元素，与第一子层的主要元素不同的元素。作为最上层的磁性层包括多个叠层单元层，层叠单元层中的至少一个子层的子层组成不同，和/或子层的不同膜厚在至少一个子层之间，层压单元层。

3. 发明申请

US20130229895A1 MAGNETIC HEAD, MAGNETIC RECORDING METHOD AND APPARATUS FOR CONTROLLING MAGNETIC HEAD WITH SPIN TORQUE OSCILLATOR IN A DISK DRIVE 有权
标题翻译：磁头，磁记录方法和用于控制旋转磁头中的旋转振荡器的磁头的装置
公开(公告)号：US20130229895A1
公开(公告)日：2013-09-05
申请号：US13762752
申请日：2013-02-08
申请人： HITACHI, LTD.
发明人： Yoshihiro SHIROISHI , Hiroshi FUKUDA , Harukazu MIYAMOTO , Junko USHIYAMA , Katsuro WATANABE , Yoshiyuki HIRAYAMA , Masukazu IGARASHI
IPC分类号： G11B13/04
CPC分类号： G11B13/04 , G11B5/1278 , G11B5/23 , G11B5/3146 , G11B2005/0024
摘要： A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.
摘要翻译：微波辅助磁记录头包括产生用于写入垂直磁记录介质的记录场的记录磁极单元和产生高频磁场的高频磁场振荡器。记录磁极单元包括具有主记录场分量集中的写间隙部分的磁芯，并且高频磁场振荡器设置在写间隙中。

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