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公开(公告)号：US11380352B2
公开(公告)日：2022-07-05
申请号：US17015688
申请日：2020-09-09
Inventor： Hitoshi Iwasaki , Masayuki Takagishi , Naoyuki Narita , Tazumi Nagasawa , Hirofumi Suto
Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, and an electrical circuit. The magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first magnetic layer, a second magnetic layer, a first layer provided between the first and second magnetic layers, and a first nonmagnetic layer provided between the first magnetic layer and the first layer. A change rate of an electrical resistance of the stacked body with respect to a change of a current density flowing in the stacked body has a first value when the current density is in a first range, a second value when the current density is in a second range, and a third value when the current density is in a third range.
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公开(公告)号：US11217272B2
公开(公告)日：2022-01-04
申请号：US17015493
申请日：2020-09-09
Inventor： Hirofumi Suto , Naoyuki Narita , Tazumi Nagasawa , Masayuki Takagishi , Hitoshi Iwasaki
Abstract: According to one embodiment, a magnetic head includes a recording portion. The recording portion includes a magnetic pole, a shield, and a stacked body provided between the magnetic pole and the shield. The stacked body includes a first magnetic layer, a first layer provided between the first magnetic layer and the magnetic pole, and a first intermediate layer provided between the first magnetic layer and the shield. The first layer contacts the magnetic pole and includes at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr. The first intermediate layer includes at least one selected from a first group consisting of Cu, Ag, Au, Al, Cr, and Ru.
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公开(公告)号：US11138994B2
公开(公告)日：2021-10-05
申请号：US16565749
申请日：2019-09-10
Inventor： Tazumi Nagasawa , Naoyuki Narita , Hirofumi Suto , Masayuki Takagishi , Tomoyuki Maeda
Abstract: According to one embodiment, a magnetic head includes a shield, a magnetic pole, a first magnetic layer provided between the shield and the magnetic pole, a second magnetic layer provided between the first magnetic layer and the magnetic pole, a third magnetic layer provided between the second magnetic layer and the magnetic pole, a first nonmagnetic layer provided between the shield and the first magnetic layer, a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer, and a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole. The first and third nonmagnetic layers include one of Cu, Ag, Au, Al, and Ti. The second and fourth nonmagnetic layers include one of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru.
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公开(公告)号：US10950259B2
公开(公告)日：2021-03-16
申请号：US16914382
申请日：2020-06-28
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Naoyuki Narita , Hirofumi Suto , Tomoyuki Maeda
Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.
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公开(公告)号：US10943609B2
公开(公告)日：2021-03-09
申请号：US16541344
申请日：2019-08-15
Inventor： Naoyuki Narita , Tomoyuki Maeda
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.
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Patent Agency Ranking
6.发明授权公开(公告)号：US10657990B2
公开(公告)日：2020-05-19
申请号：US15902531
申请日：2018-02-22
Inventor： Masaya Ohtake , Akihiko Takeo , Naoyuki Narita , Gaku Koizumi , Yusuke Tomoda , Tomoyuki Maeda
Abstract: A magnetic head includes a main magnetic pole, a write shield separated from the main magnetic pole by a write gap, a first side shield that is separated from the main magnetic pole by a first side gap, a second side shield that is separated from the main magnetic pole by a second side gap, a first layer that has a first magnetic relative permeability and is disposed in the write gap between the main magnetic pole and the write shield, and a second layer that has a second magnetic relative permeability and is disposed in the first side gap and the second side gap, wherein the first magnetic relative permeability is smaller than the second magnetic relative permeability.
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公开(公告)号：US10438616B2
公开(公告)日：2019-10-08
申请号：US16218604
申请日：2018-12-13
Applicant: Kabushiki Kaisha Toshiba
Inventor： Kenichiro Yamada , Shuichi Murakami , Naoyuki Narita , Katsuhiko Koui , Akihiko Takeo , Mariko Shimizu , Hitoshi Iwasaki
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.
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8.发明授权公开(公告)号：US10276193B2
公开(公告)日：2019-04-30
申请号：US15913288
申请日：2018-03-06
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Naoyuki Narita , Tomoyuki Maeda , Masaya Ohtake , Gaku Koizumi , Yusuke Tomoda , Akihiko Takeo
IPC: G11B5/31
Abstract: According to one embodiment, a magnetic head includes a magnetic pole having a first surface, a first shield separated from the magnetic pole along the first surface, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer, and first and second conductive layers. The magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni. The first conductive layer contacts the magnetic pole and the magnetic layer, and is provided between the magnetic pole and the magnetic layer. The second conductive layer contacts the magnetic layer and the first shield, is provided between the magnetic layer and the first shield. The first shield has a first shield surface contacting the second conductive layer. A ratio of a length of the magnetic layer to a length of the first shield surface is 0.1 or more.
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公开(公告)号：US20190066717A1
公开(公告)日：2019-02-28
申请号：US15902531
申请日：2018-02-22
Inventor： Masaya OHTAKE , Akihiko Takeo , Naoyuki Narita , Gaku Koizumi , Yusuke Tomoda , Tomoyuki Maeda
Abstract: A magnetic head includes a main magnetic pole, a write shield separated from the main magnetic pole by a write gap, a first side shield that is separated from the main magnetic pole by a first side gap, a second side shield that is separated from the main magnetic pole by a second side gap, a first layer that has a first magnetic relative permeability and is disposed in the write gap between the main magnetic pole and the write shield, and a second layer that has a second magnetic relative permeability and is disposed in the first side gap and the second side gap, wherein the first magnetic relative permeability is smaller than the second magnetic relative permeability.
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公开(公告)号：US20190051322A1
公开(公告)日：2019-02-14
申请号：US15896281
申请日：2018-02-14
Inventor： Gaku Koizumi , Akihiko Takeo , Naoyuki Narita , Masaya Ohtake , Yusuke Tomoda , Tomoyuki Maeda
CPC classification number: G11B5/3967 , G11B5/012 , G11B5/1278 , G11B5/3143 , G11B5/315 , G11B2005/0024
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.
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