公开(公告)号：US20200294535A1

公开(公告)日：2020-09-17

申请号：US16541344

申请日：2019-08-15

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

Inventor： Naoyuki Narita ,  Tomoyuki Maeda

IPC: G11B5/11 ,  G11B5/147

Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, a first circuit, and a second circuit. The magnetic head includes a magnetic pole, a first shield, a stacked body provided between the magnetic pole and the first shield, a first terminal electrically connected to the magnetic pole, a second terminal electrically connected to the first shield, and a coil. The first circuit is electrically connected to the first terminal and the second terminal. The second circuit is electrically connected to the coil. The first circuit performs at least a first operation. In the first operation, the first circuit supplies a first current to a current path between the first and second terminals when the second circuit supplies a recording current to the coil. The first current is smaller than a second current. The second current causes an electrical resistance of the current path to oscillate.

公开(公告)号：US10403308B2

公开(公告)日：2019-09-03

申请号：US15896281

申请日：2018-02-14

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Gaku Koizumi ,  Akihiko Takeo ,  Naoyuki Narita ,  Masaya Ohtake ,  Yusuke Tomoda ,  Tomoyuki Maeda

IPC: G11B5/31 ,  G11B5/012 ,  G11B5/127 ,  G11B5/39 ,  G11B5/00

Abstract: According to one embodiment, a magnetic disk device conforming to perpendicular magnetic recording includes a magnetic disk, a recording head, and a controller. The head includes a main magnetic pole, a return magnetic pole, a recording coil, and a conductive member in which end surfaces are connected to opposed surfaces of a write gap which is opposed to a distal portion of the main magnetic pole and a distal portion of the return magnetic pole, and a resistance value varies. The controller applies a current to the recording coil to excite the magnetic flux in the recording operation, and applies a current at a constant voltage to the magnetic circuit via the comductive member.

公开(公告)号：US09886971B2

公开(公告)日：2018-02-06

申请号：US15254236

申请日：2016-09-01

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Kenichiro Yamada ,  Shuichi Murakami ,  Naoyuki Narita ,  Katsuhiko Koui ,  Akihiko Takeo ,  Mariko Shimizu ,  Hitoshi Iwasaki

IPC: G11B5/235 ,  G11B5/31 ,  G11B5/17 ,  G11B5/127 ,  G11B5/00

CPC classification number: G11B5/1278 ,  G11B5/17 ,  G11B5/235 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/3143 ,  G11B5/3146 ,  G11B2005/0024

Abstract: According to one embodiment, a magnetic recording head includes a magnetic pole, a stacked body, and a first non-magnetic layer. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the magnetic pole, and a non-magnetic intermediate layer provided between the first magnetic layer and the second magnetic layer. The first non-magnetic layer is provided between the second magnetic layer and the magnetic pole, and contacts the magnetic pole and the second magnetic layer. The first magnetic layer has a first thickness and a first saturation magnetic flux density. The second magnetic layer has a second thickness and a second saturation magnetic flux density. A second product of the second thickness and the second saturation magnetic flux density is larger than a first product of the first thickness and the first saturation magnetic flux density.

公开(公告)号：US09373356B2

公开(公告)日：2016-06-21

申请号：US14887998

申请日：2015-10-20

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Kenichiro Yamada ,  Masayuki Takagishi ,  Tomoyuki Maeda ,  Yousuke Isowaki ,  Naoyuki Narita ,  Shuichi Murakami

IPC: G11B5/86 ,  G11B5/02 ,  G11B20/12 ,  G11B5/012

CPC classification number: G11B20/1217 ,  G11B5/012 ,  G11B5/02 ,  G11B5/82 ,  G11B2020/1238

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a recording unit, and a reproducing unit. The magnetic recording medium includes a first track including first and second sub-tracks extending in a first direction. The second sub-track is arranged with the first sub-track in a second direction intersecting the first direction. The recording unit records information in the first and second sub-tracks. The reproducing unit reproduces the information recorded in the first and second sub-tracks while opposing the first, second sub-tracks, and a boundary between the first and second sub-tracks. The first sub-track includes first magnetic recording components including first and second components. The second sub-track includes second magnetic recording components including third and fourth components. A first recording symbol is formed of the first and third components. A second recording symbol is formed of the second and fourth components.

Abstract translation: 根据一个实施例，磁记录和再现装置包括磁记录介质，记录单元和再现单元。 磁记录介质包括第一轨道，该第一轨道包括沿第一方向延伸的第一和第二子轨道。 第二子轨道与第一子轨道沿与第一方向相交的第二方向布置。 记录单元将信息记录在第一和第二子轨道中。 再现单元再现与第一和第二子轨道相对的第一和第二子轨道中记录的信息，以及第一和第二子轨道之间的边界。 第一子轨道包括包括第一和第二分量的第一磁记录部件。 第二子轨道包括第二和第四分量的第二磁记录组件。 第一记录符号由第一和第三分量形成。 第二记录符号由第二和第四分量形成。

公开(公告)号：US08717705B1

公开(公告)日：2014-05-06

申请号：US13896769

申请日：2013-05-17

Applicant: Kabushiki Kaisha Toshiba

Inventor： Kenichiro Yamada ,  Naoyuki Narita ,  Katsuhiko Koui ,  Akihiko Takeo

IPC: G11B5/31

CPC classification number: G11B5/314 ,  G11B5/1278 ,  G11B5/315 ,  G11B2005/001 ,  G11B2005/0029

Abstract: According to one embodiment, a magnetic recording head includes a facing surface configured to face a recording medium, a main magnetic pole configured to apply a recording magnetic field to a recording layer of the recording medium, and a high-frequency oscillator disposed near to a trailing side of the main magnetic pole and configured to apply a high-frequency magnetic field to the recording layer. An angle defined between a recording magnetic field applied from the main magnetic pole to the recording medium and the facing surface is 0 to 85° in a region between a trailing side end of the main magnetic pole and a trailing side end of the high-frequency oscillator.

Abstract translation: 根据一个实施例，磁记录头包括被配置为面对记录介质的面对表面，被配置为向记录介质的记录层施加记录磁场的主磁极和设置在记录介质附近的高频振荡器 主磁极的后侧，构成为向记录层施加高频磁场。 在从主磁极施加到记录介质的记录磁场和面对面之间限定的角度在主磁极的后侧端和高频侧的后端之间的区域中为0至85° 振荡器

公开(公告)号：US20140078618A1

公开(公告)日：2014-03-20

申请号：US13792932

申请日：2013-03-11

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Takuya Matsumoto ,  Tomoko Taguchi ,  Kenichiro Yamada ,  Naoyuki Narita

IPC: G11B5/23 ,  G11B5/127

CPC classification number: G11B5/23 ,  G11B5/1278 ,  G11B5/314 ,  G11B2005/0024

Abstract: According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to generate a magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole opposite to a trailing side of the main pole with a gap, a coil configured to excite a magnetic flux in a magnetic circuit, and a high-frequency oscillator provided between a tip portion of the main pole on a side of the recording medium and the write shield magnetic pole to generate a high-frequency magnetic field. The write shield magnetic pole includes an end face opposite to the high-frequency oscillator and the end face is formed so that a distance from the main pole increases with an increasing distance from the recording medium.

Abstract translation: 根据一个实施例，磁盘驱动器的磁记录头包括被配置为在垂直于记录介质的记录层的方向上产生磁场的主极，与主极的后侧相对的写保护磁极 具有间隙，被配置为激励磁路中的磁通的线圈，以及设置在记录介质侧的主极的顶端部分与写保护磁极之间的高频振荡器， 频率磁场。 写屏蔽磁极包括与高频振荡器相对的端面，并且端面形成为使得距离主极的距离随着与记录介质的距离的增加而增加。

公开(公告)号：US08614861B1

公开(公告)日：2013-12-24

申请号：US13712027

申请日：2012-12-12

Applicant: Kabushiki Kaisha Toshiba

Inventor： Yusuke Tomoda ,  Kenichiro Yamada ,  Naoyuki Narita

IPC: G11B5/127 ,  G11B5/187

CPC classification number: G11B5/127 ,  G11B5/1278 ,  G11B5/235 ,  G11B5/3116 ,  G11B5/3146 ,  G11B19/2009 ,  G11B2005/0024

Abstract: According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, and a high-frequency oscillator disposed adjacent to the main pole and near a air-bearing surface which faces the recording medium. The high-frequency oscillator includes a lower end surface located nearest to the air-bearing surface and an upper end surface located farthest from the air-bearing surface. A length of the lower end surface in a cross track direction is longer than a length of the upper end surface in the cross track direction.

Abstract translation: 根据一个实施例，磁记录头包括被配置为将记录磁场施加到记录介质的记录层的主极，以及邻近主极设置并靠近空气轴承表面的高频振荡器 记录介质。 高频振荡器包括位于最靠近空气轴承表面的下端表面和位于最远离空气轴承表面的上端表面。 下端面的交叉轨道方向的长度比交叉轨道方向上的上端面的长度长。