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公开(公告)号：US20240233754A9
公开(公告)日：2024-07-11
申请号：US18359982
申请日：2023-07-27
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Tazumi NAGASAWA , Satoshi SHIROTORI , Akira KIKITSU , Yoshihiro HIGASHI
CPC classification number: G11B5/11 , G11B5/1272 , G11B5/374 , G11B5/3912
Abstract: According to one embodiment, a magnetic sensor includes first to sixth shields, first and second magnetic layers, a first member, and first to fourth terminals. The first magnetic layer is provided between the first shield and the second shield. The first magnetic layer is between the third shield and the fourth shield in the second direction. The second magnetic layer is provided between the first magnetic layer and the second shield. The second magnetic layer is between the fifth shield and the sixth shield in the second direction. The second magnetic layer is electrically connected to the fifth shield and the sixth shield. The first member includes a first region and a second region. The first region is provided between the third shield and the first magnetic layer. The second region is provided between the first magnetic layer and the fourth shield.
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公开(公告)号：US20230062839A1
公开(公告)日：2023-03-02
申请号：US17586024
申请日：2022-01-27
Inventor： Yuji NAKAGAWA , Masayuki TAKAGISHI , Naoyuki NARITA , Tazumi NAGASAWA , Tomoyuki MAEDA
Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a shield, and a non-magnetic layer. The non-magnetic layer is provided between the magnetic pole and the shield. The non-magnetic layer is in contact with the magnetic pole and the shield. The non-magnetic layer includes a first element including at least one selected from the group consisting of Cu, Au, Cr, V, Al and Ag.
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公开(公告)号：US20220399033A1
公开(公告)日：2022-12-15
申请号：US17587198
申请日：2022-01-28
Inventor： Yuji NAKAGAWA , Naoyuki NARITA , Masayuki TAKAGISHI , Tomoyuki MAEDA , Tazumi NAGASAWA , Kenichiro YAMADA , Akira KIKITSU
Abstract: 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.
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公开(公告)号：US20220375494A1
公开(公告)日：2022-11-24
申请号：US17817818
申请日：2022-08-05
Inventor： Hitoshi IWASAKI , Naoyuki NARITA , Hirofumi SUTO , Masayuki TAKAGISHI , Tazumi NAGASAWA
IPC: G11B5/127
Abstract: A magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and second magnetic poles. The stacked body includes a first magnetic member, a second magnetic member provided between the first magnetic member and the second magnetic pole, a first layer provided between the first and second magnetic members, and a second layer provided between the second magnetic member and the second magnetic pole. The first magnetic member includes first magnetic regions and a first nonmagnetic region. The first nonmagnetic region is between the one of the first magnetic regions and the other one of the first magnetic regions.
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公开(公告)号：US20200168244A1
公开(公告)日：2020-05-28
申请号：US16552009
申请日：2019-08-27
Inventor： Hirofumi SUTO , Naoyuki NARITA , Tazumi NAGASAWA , Masayuki TAKAGISHI , Tomoyuki MAEDA
IPC: G11B5/31
Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, first and second conductive layers. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer contacts the first shield and the magnetic layer, is provided between the first shield and the magnetic layer, and includes at least one selected from Cu, Ag, and Au. The second conductive layer is provided between the magnetic pole and the magnetic layer. The second conductive layer includes first and second regions. The first region contacts the magnetic layer and includes at least one first element selected from Cu, Ag, Au, Al, Ti, Ru, Mg, and V. The second region is provided between the first region and the magnetic pole and includes at least one second element selected from Ta, Pt, W, Mo, Ir, Cr, Tb, Rh, and Pd.
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Patent Agency Ranking
公开(公告)号：US20200082845A1
公开(公告)日：2020-03-12
申请号：US16299392
申请日：2019-03-12
Inventor： Hirofumi SUTO , Naoyuki NARITA , Tazumi NAGASAWA , Masayuki TAKAGISHI , Tomoyuki MAEDA
Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, a first conductive layer, and a second conductive layer. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer includes at least one of Cu, Ag, Au, Al and Cr, and is provided between the magnetic pole and the first shield. A direction from the first conductive layer toward the magnetic layer crosses a first direction from the magnetic pole toward the first shield. A second conductive layer includes at least one of Ta, Pt, W, Ru, Mo, Ir, Rh, and Pd and is provided at one of a first position or a second position. The first position is between the first conductive layer and the first shield. The second position is between the magnetic pole and the first conductive layer.
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公开(公告)号：US20170256273A1
公开(公告)日：2017-09-07
申请号：US15266161
申请日：2016-09-15
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Hirofumi SUTO , Kiwamu KUDO , Koichi MIZUSHIMA , Tazumi NAGASAWA , Taro KANAO , Rie SATO
CPC classification number: G11B5/09 , G11B5/012 , G11B5/313 , G11B5/3146 , G11B2005/0021 , G11B2005/0024
Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.
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公开(公告)号：US20160027455A1
公开(公告)日：2016-01-28
申请号：US14796462
申请日：2015-07-10
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Kiwamu KUDO , Hirofumi SUTO , Tazumi NAGASAWA , Koichi MIZUSHIMA , Rie SATO
CPC classification number: G11B5/00 , G11B5/235 , G11B5/3146 , G11B2005/0002 , G11B2005/0021 , G11B2005/0024 , G11B2005/3996
Abstract: According to an embodiment, a magnetic recording head includes a main magnetic pole and a spin torque oscillator. The spin torque oscillator includes a first perpendicular free layer, a second perpendicular free layer, and a first spacer layer, each of the first perpendicular free layer and the second perpendicular free layer including a magnetic anisotropy axis in a direction perpendicular to a film plane of the spin torque oscillator. An effective perpendicular magnetic anisotropy magnetic field of the first perpendicular free layer is smaller than an effective perpendicular magnetic anisotropy magnetic field of the second perpendicular free layer, and a current is applied from the first perpendicular free layer side to the second perpendicular free layer side.
Abstract translation: 根据实施例，磁记录头包括主磁极和自旋扭矩振荡器。 自旋扭矩振荡器包括第一垂直自由层，第二垂直自由层和第一间隔层，第一垂直自由层和第二垂直自由层中的每一个包括在垂直于膜平面的方向上的磁各向异性轴 自旋扭矩振荡器。 第一垂直自由层的有效垂直磁各向异性磁场小于第二垂直自由层的有效垂直磁各向异性磁场，并且从第一垂直自由层侧向第二垂直自由层侧施加电流。
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公开(公告)号：US20240257829A1
公开(公告)日：2024-08-01
申请号：US18354959
申请日：2023-07-19
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Satoshi SHIROTORI , Tazumi NAGASAWA , Akira KIKITSU , Yoshihiro HIGASHI
CPC classification number: G11B5/11 , G11B5/1272 , G11B5/486
Abstract: According to one embodiment, a magnetic head includes first to fourth shields, first to fourth terminals, and first magnetic member. The third shield includes a first partial region and a second partial region. The fourth shield includes a third partial region and a fourth partial region. The first magnetic member is provided between a portion of the first shield and a portion of the second shield in a first direction from the first shield to the second shield. The first magnetic member is provided between the first partial region and the third partial region in a second direction crossing the first direction. The portion of the first shield is located between the second partial region and the fourth partial region in the second direction.
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公开(公告)号：US20230178102A1
公开(公告)日：2023-06-08
申请号：US17813256
申请日：2022-07-18
Inventor： Yuji NAKAGAWA , Naoyuki NARITA , Masayuki TAKAGISHI , Tomoyuki MAEDA , Tazumi NAGASAWA
IPC: G11B5/193
CPC classification number: G11B5/193
Abstract: According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first and second magnetic poles. The stacked body includes first to fourth magnetic layers, and first to fifth non-magnetic layers. The second non-magnetic layer is in contact with the second and first magnetic layers. The third non-magnetic layer is in contact with the third and second magnetic layers. The fourth non-magnetic layer is in contact with the fourth and third magnetic layers. A fourth thickness of the fourth magnetic layer along a first direction from the first magnetic pole to the second magnetic pole is not less than 0.5 times and not more than 1.6 times a first thickness of the first magnetic layer along the first direction. A second thickness of the second magnetic layer along the first direction is less than the first thickness.
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