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公开(公告)号：US20240361404A1
公开(公告)日：2024-10-31
申请号：US18768695
申请日：2024-07-10
申请人： TDK CORPORATION
发明人： Kazuya Watanabe , Kenzo Makino
CPC分类号： G01R33/093 , G01R33/0005
摘要： A magnetic sensor includes a substrate including a top surface, an insulating layer including an inclined surface, and a magnetic detection element disposed on the inclined surface. The magnetic detection element includes a first side surface and a second side surface. The first side surface is located at a position forward in a first direction that is one direction along the inclined surface. The second side surface is located at a position forward in a second direction that is another direction along the inclined surface. The magnetic detection element includes a first non-constant portion in which a gap between an upper end of the first side surface and an upper end of the second side surface becomes smaller along the longitudinal direction of the magnetic detection element.
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公开(公告)号：US10830614B2
公开(公告)日：2020-11-10
申请号：US16160144
申请日：2018-10-15
申请人： TDK CORPORATION
发明人： Kenzo Makino , Tsuyoshi Umehara
IPC分类号： G01D5/16
摘要： A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.
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公开(公告)号：US10718828B2
公开(公告)日：2020-07-21
申请号：US15908066
申请日：2018-02-28
申请人： TDK CORPORATION
摘要： A magneto-resistive effect element includes a magnetization free layer, an intermediate layer, and a magnetization pinned layer. The magnetization free layer extends along a first plane. The intermediate layer extends along the first plane, and is stacked on the magnetization free layer. The magnetization pinned layer extends along the first plane, and is provided on side opposite to the magnetization free layer with the intermediate layer being interposed therebetween. Here, the magnetization free layer includes an end surface that has a maximum inclination angle of 42° or less relative to the first plane.
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公开(公告)号：US10672421B2
公开(公告)日：2020-06-02
申请号：US16294206
申请日：2019-03-06
申请人： TDK CORPORATION
发明人： Kenzo Makino
摘要： A magnetoresistive device includes an MR element and a bias magnetic field generation unit. The MR element includes a free layer shaped to be long in one direction. The bias magnetic field generation unit includes a ferromagnetic layer for generating a bias magnetic field. The ferromagnetic layer includes two main portions, a first side portion, and a second side portion arranged to surround the perimeter of the free layer. In any cross section perpendicular to the longitudinal direction of the free layer, a shortest distance between the first side portion and the free layer and a shortest distance between the second side portion and the free layer are 35 nm or less.
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公开(公告)号：US10401441B2
公开(公告)日：2019-09-03
申请号：US15891576
申请日：2018-02-08
申请人： TDK CORPORATION
发明人： Keisuke Uchida , Kenzo Makino , Hiraku Hirabayashi
摘要： A magnetic sensor includes a magnetic field conversion unit and a magnetic field detection unit. The magnetic field conversion unit receives an input magnetic field containing an input magnetic field component in a direction parallel to Z direction, and generates an output magnetic field containing an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit receives the output magmetic field and generates an output signal corresponding to the input magnetic field component. The magnetic field detection unit includes first and second magnetic detection elements. When misalignment occurs between the magnetic field conversion unit and the magnetic field detection unit, one of the strength of a portion of the output magnetic field component that the first magnetic detection element receives and the strength of a portion of the output magnetic field component that the second magnetic detection element receives increases while the other decreases.
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公开(公告)号：US09792934B2
公开(公告)日：2017-10-17
申请号：US15059383
申请日：2016-03-03
申请人： TDK Corporation
发明人： Tetsuya Hiraki , Minoru Ota , Hisayoshi Watanabe , Kenzo Makino , Hideyuki Ukita
CPC分类号： G11B5/3912 , G11B5/112 , G11B5/3163 , G11B5/3909 , G11B5/3951 , G11B5/3977
摘要： A multi reader head has a plurality of readers that are laminated via a gap layer(s), and each of the readers has a structure in which a current-perpendicular-to-plane (CPP) type of magneto-resistive effect element, where a current flows along the lamination direction, is interposed between a pair of shields that function as an electrode, respectively, from both sides in the lamination direction. The shields that are opposed from each other via the gap layer of the readers that are adjacent in the lamination direction by a distance that is not constant, but include a portion with a greater distance between the shields and another portion with a smaller distance between the shields are included. The portion with a greater distance between the shields is situated at a position away from the center on an air bearing surface opposing to a recording medium in the magneto-resistive effect element.
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公开(公告)号：US20240272249A1
公开(公告)日：2024-08-15
申请号：US18626381
申请日：2024-04-04
申请人： TDK CORPORATION
发明人： Hirokazu Takahashi , Kenzo Makino
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/096 , G01R33/098
摘要： A magnetic sensor includes an MR element and a support member. The support member has an opposed surface including a first inclined portion, and a bottom surface. In a given cross section, the first inclined portion is inclined at a first angle at a first position, and inclined at a second angle smaller than the first angle at a second position. The absolute value of a curvature of the first inclined portion at the first position is less than the absolute value of the curvature of the first inclined portion at the second position. The MR element is provided on the first inclined portion so that the first edge is located above the first position in a given cross section.
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公开(公告)号：US12000910B2
公开(公告)日：2024-06-04
申请号：US17945514
申请日：2022-09-15
申请人： TDK CORPORATION
CPC分类号： G01R33/093 , G01R33/0047
摘要： A magnetic sensor includes an insulating layer, a first MR element, and a second MR element. The insulating layer includes a protruding surface including first and second inclined surfaces. Each of the first and second MR elements includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer of the first MR element are disposed on the first inclined surface. The magnetization pinned layer and the free layer of the second MR element are disposed on the second inclined surface. The dimension of the protruding surface in a direction parallel to the Z direction is in the range of 1.4 μm to 3.0 μm.
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公开(公告)号：US11977136B2
公开(公告)日：2024-05-07
申请号：US18339666
申请日：2023-06-22
申请人： TDK CORPORATION
发明人： Hirokazu Takahashi , Kenzo Makino
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/096 , G01R33/098
摘要： A magnetic sensor includes an MR element and a support member. The support member has an opposed surface including a first inclined portion, and a bottom surface. In a given cross section, the first inclined portion is inclined at a first angle at a first position, and inclined at a second angle smaller than the first angle at a second position. The absolute value of a curvature of the first inclined portion at the first position is less than the absolute value of the curvature of the first inclined portion at the second position. The MR element is provided on the first inclined portion so that the first edge is located above the first position in a given cross section.
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公开(公告)号：US11726150B2
公开(公告)日：2023-08-15
申请号：US17575197
申请日：2022-01-13
申请人： TDK CORPORATION
发明人： Hirokazu Takahashi , Kenzo Makino
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/096 , G01R33/098
摘要： A magnetic sensor includes an MR element and a support member. The support member has an opposed surface including a first inclined portion, and a bottom surface. In a given cross section, the first inclined portion is inclined at a first angle at a first position, and inclined at a second angle smaller than the first angle at a second position. The absolute value of a curvature of the first inclined portion at the first position is less than the absolute value of the curvature of the first inclined portion at the second position. The MR element is provided on the first inclined portion so that the first edge is located above the first position in a given cross section.
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