公开(公告)号：US20160012863A1

公开(公告)日：2016-01-14

申请号：US14736759

申请日：2015-06-11

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Akira Kikitsu ,  Tomoyuki Maeda ,  Masayuki Takagishi ,  Kenichiro Yamada

IPC: G11B33/14 ,  G11B20/10 ,  G11B5/74

CPC classification number: G11B5/746 ,  G11B5/743 ,  G11B5/82 ,  G11B20/1217 ,  G11B2005/0021 ,  G11B2005/0024 ,  G11B2220/235

Abstract: A magnetic recording and reproducing device according to an embodiment includes a magnetic recording medium and a controller. The magnetic recording medium includes in sequence a substrate, a storage layer, an exchange layer, and a surface recording layer. The controller executes following steps (1) to (6): (1) magnetically recording first information on the surface recording layer; (2) transferring the first information recorded on the surface recording layer to the storage layer; (3) magnetically recording second information on the surface recording layer; (4) magnetically reproducing the second information from the surface recording layer; (5) transferring the first information recorded on the storage layer to the surface recording layer; and (6) magnetically reproducing the first information transferred to the surface recording layer.

Abstract translation: 根据实施例的磁记录和再现装置包括磁记录介质和控制器。 磁记录介质依次包括衬底，存储层，交换层和表面记录层。 控制器执行以下步骤（1）至（6）：（1）在表面记录层上磁记录第一信息; （2）将记录在表面记录层上的第一信息传送到存储层; （3）在表面记录层上磁记录第二信息; （4）从表面记录层磁再现第二信息; （5）将记录在存储层上的第一信息传送到表面记录层; 和（6）磁性再现传送到表面记录层的第一信息。

公开(公告)号：US09208802B2

公开(公告)日：2015-12-08

申请号：US14610759

申请日：2015-01-30

Applicant: Kabushiki Kaisha Toshiba

Inventor： Kenichiro Yamada ,  Katsuhiko Koui

IPC: G11B5/127 ,  G11B5/35 ,  G11B5/00 ,  G11B5/31

CPC classification number: G11B5/35 ,  G11B5/1278 ,  G11B5/315 ,  G11B2005/0005 ,  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, a trailing shield opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between the main pole and the trailing shield in a range of a width of the main pole in a track width direction, and configured to generate a high-frequency magnetic field. The high-frequency oscillator includes a spin injection layer, an intermediate layer, and an oscillation layer, and at least the oscillation layer comprises divided oscillation regions.

公开(公告)号：US09147411B2

公开(公告)日：2015-09-29

申请号：US14627003

申请日：2015-02-20

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Masayuki Takagishi ,  Hitoshi Iwasaki ,  Kenichiro Yamada ,  Yousuke Isowaki ,  Kohsuke Harada

IPC: G11B5/39 ,  G11B5/11

CPC classification number: G11B5/3912 ,  G11B5/11 ,  G11B5/3909 ,  G11B2005/3996

Abstract: According to one embodiment, a magnetic recording and reproducing device includes magnetic recording medium and a magnetic head. The magnetic recording medium includes a first surface. A plurality of bits is provided in the first surface. Each of the bits has a direction of magnetization corresponding to recorded information. The magnetic head includes a reproducing unit. The reproducing unit senses the direction of magnetization. The reproducing unit includes a first shield, a second shield, a first magnetic layer, a second magnetic layer, a third magnetic layer, a fourth magnetic layer, an intermediate layer, a first nonmagnetic layer, and a second nonmagnetic layer. The first and the second nonmagnetic layers include at least one selected from ruthenium, copper, and tantalum. A distance between the first shield and the second shield is not less than 3 times and not more than 7 times a length of each of the bits.

Abstract translation: 根据一个实施例，磁记录和再现装置包括磁记录介质和磁头。 磁记录介质包括第一表面。 在第一表面中提供多个位。 每个位具有对应于记录信息的磁化方向。 磁头包括再现单元。 再现单元感测磁化方向。 再现单元包括第一屏蔽，第二屏蔽，第一磁性层，第二磁性层，第三磁性层，第四磁性层，中间层，第一非磁性层和第二非磁性层。 第一和第二非磁性层包括选自钌，铜和钽中的至少一种。 第一屏蔽和第二屏蔽之间的距离不小于每个位的长度的3倍且不超过7倍。

公开(公告)号：US09129617B2

公开(公告)日：2015-09-08

申请号：US14623047

申请日：2015-02-16

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Kenichiro Yamada ,  Hitoshi Iwasaki ,  Masayuki Takagishi

IPC: G11B5/35 ,  G11B5/09 ,  G11B5/127

CPC classification number: G11B5/09 ,  G11B5/1278 ,  G11B5/3123 ,  G11B5/3133 ,  G11B5/35 ,  G11B20/10222 ,  G11B2005/001

Abstract: An example magnetic recording apparatus includes a magnetic recording medium, a magnetic recording head and a signal processor. The magnetic recording head includes a first magnetic pole; a second magnetic pole; a spin torque oscillator; a first coil to magnetize the first magnetic pole; and a second coil through which a current is passed independently of the first coil. The signal processor writes and reads a signal on the magnetic recording medium by using the magnetic recording head and includes a first current circuit to supply a recording current to the first coil and a second current circuit to supply a modulating current to the second coil.

Abstract translation: 一种示例性磁记录装置包括磁记录介质，磁记录头和信号处理器。 磁记录头包括第一磁极; 第二磁极; 自旋转矩振荡器; 使第一磁极磁化的第一线圈; 以及电流独立于第一线圈通过的第二线圈。 信号处理器通过使用磁记录头在磁记录介质上写入和读取信号，并且包括向第一线圈提供记录电流的第一电流电路和向第二线圈提供调制电流的第二电流电路。

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。

公开(公告)号：US12165676B2

公开(公告)日：2024-12-10

申请号：US18329949

申请日：2023-06-06

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

Inventor： Yuji Nakagawa ,  Naoyuki Narita ,  Masayuki Takagishi ,  Tomoyuki Maeda ,  Tazumi Nagasawa ,  Kenichiro Yamada ,  Akira Kikitsu

IPC: G11B5/21 ,  G11B5/127 ,  G11B5/31

Abstract: According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a magnetic member. The magnetic element is provided between the first and second magnetic poles, and includes a first magnetic layer. The magnetic member includes a first magnetic part. A second direction from the first magnetic part to the magnetic element crosses a first direction from the first to second magnetic pole. The first magnetic part includes a magnetic material including at least one of first to third materials. The first material includes at least one selected from the group consisting of Mn3Sn, Mn3Ge and Mn3Ga. The second material includes at least one selected from the group consisting of a cubic or tetragonal compound including Mn and Ni, a cubic alloy including γ-phase Mn, and a cubic alloy including Fe. The third material includes an antiferromagnet.

公开(公告)号：US11513174B2

公开(公告)日：2022-11-29

申请号：US17400860

申请日：2021-08-12

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Hitoshi Iwasaki ,  Satoshi Shirotori ,  Akira Kikitsu ,  Yoshihiro Higashi ,  Kenichiro Yamada

IPC: G01R33/02 ,  G01R33/09 ,  G01R31/382 ,  A61B5/245

Abstract: According to one embodiment, a magnetic sensor includes a first magnetic element, a conductive member including a first corresponding portion, an element current circuit configured to supply an element current to the first magnetic element, and a first current circuit configured to supply a first current to the first corresponding portion. The first corresponding portion is along the first magnetic element. The first current includes an alternating current component. The first current includes a first duration of a first current value of a first polarity, a first pulse duration of a first pulse current value of the first polarity, a second duration of a second current value of a second polarity, and a second pulse duration of a second pulse current value of the second polarity. The second polarity is different from the first polarity.

公开(公告)号：US11280853B2

公开(公告)日：2022-03-22

申请号：US16814060

申请日：2020-03-10

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Satoshi Shirotori ,  Kenichiro Yamada ,  Yoshihiko Fuji ,  Yoshihiro Higashi ,  Akira Kikitsu

IPC: G01R33/04 ,  G01R33/00 ,  H01F10/32

Abstract: According to one embodiment, a magnetic sensor includes a first element, a first wire, and a first magnetic part. The first element includes a first magnetic layer, a first counter magnetic layer, and a first nonmagnetic layer provided between the first magnetic layer and the first counter magnetic layer. A direction from the first counter magnetic layer toward the first magnetic layer is along a first direction. The first wire extends in a second direction crossing the first direction. The first magnetic part includes a first region and a first counter region. At least a portion of the first wire is between the first region and the first counter region in the first direction.