公开(公告)号：US20240103101A1

公开(公告)日：2024-03-28

申请号：US18529018

申请日：2023-12-05

Applicant: TDK Corporation

Inventor： Keisuke TAKASUGI

IPC: G01R33/09 ,  G01N33/543

CPC classification number: G01R33/093 ,  G01N33/54326 ,  H10N50/85

Abstract: A magnetic sensor used to detect a detection target substance in a sample includes a substrate having a first surface and a second surface, which is opposite the first surface and a magnetoresistive effect element provided on the first surface of the substrate. The resistance of the magnetoresistive effect element changes in accordance with an input magnetic field. A protective layer covers the top of the magnetoresistive effect element. The surface of the protective layer, which is positioned on top of the magnetoresistive effect element, has a prescribed surface roughness.

公开(公告)号：US20230092845A1

公开(公告)日：2023-03-23

申请号：US17945485

申请日：2022-09-15

Applicant: TDK CORPORATION

Inventor： Hiromichi UMEHARA ,  Keisuke TAKASUGI ,  Takehiro ISODA ,  Kenji INAGE

IPC: G01R33/09 ,  G01R33/02 ,  G01R33/00

Abstract: A magnetic sensor includes an insulating layer including a flat portion and a protruding portion, a first MR element, and a second MR element. The protruding portion includes a first inclined surface and a second inclined surface. The first MR element is disposed on the first inclined surface. The second MR element is disposed on the second inclined surface. The protruding portion extends in a first direction parallel to a top surface of a substrate, and includes a plurality of recess portions each recessed in a direction parallel to the top surface of the substrate at an end of the protruding portion in the first direction.

公开(公告)号：US20230089204A1

公开(公告)日：2023-03-23

申请号：US17895775

申请日：2022-08-25

Applicant: TDK CORPORATION

Inventor： Keisuke TAKASUGI ,  Kenzo MAKINO ,  Hiraku HIRABAYASHI ,  Masanori SAKAI

IPC: G01R33/09 ,  H01L43/02 ,  G01R15/14

Abstract: A magnetic sensor includes a first insulating layer, a second insulating layer, a third insulating layer, a lower coil element located on an opposite side of the first insulating layer from the second insulating layer, and a second MR element. The second MR element includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer are located on an opposite side of the third insulating layer from the second insulating layer. The first and third insulating layers each contain a first insulating material. The second insulating layer contains a second insulating material.

公开(公告)号：US20210123990A1

公开(公告)日：2021-04-29

申请号：US17078315

申请日：2020-10-23

Applicant: TDK Corporation

Inventor： Keisuke TAKASUGI

IPC: G01R33/09 ,  G01N33/543

Abstract: A magnetic sensor used to detect a detection target substance in a sample includes a substrate having a first surface and a second surface, which is opposite the first surface and a magnetoresistive effect element provided on the first surface of the substrate. The resistance of the magnetoresistive effect element changes in accordance with an input magnetic field. A protective layer covers the top of the magnetoresistive effect element. The surface of the protective layer, which is positioned on top of the magnetoresistive effect element, has a prescribed surface roughness.

公开(公告)号：US20180224510A1

公开(公告)日：2018-08-09

申请号：US15679284

申请日：2017-08-17

Applicant: TDK Corporation

Inventor： Naoki OHTA ,  Keisuke TAKASUGI

IPC: G01R33/09 ,  G01R33/00 ,  G07D7/04

CPC classification number: G01R33/093 ,  G01R33/0011 ,  G01R33/091 ,  G07D7/04 ,  H01L43/08 ,  H01L43/12

Abstract: A magnetic sensor having a yoke that can achieve large magnetic flux density and that can be accurately formed is provided. The magnetic sensor includes magnetic field detection element 21 that detects a magnetic field in first direction X and first yoke 23 that is located near magnetic field detection element 21 and extends in second direction Z that is orthogonal to first direction X. First yoke 23 includes first portion 23a that is located away from magnetic field detection element 21 at least in first direction X and second portion 23b that is located farther away from magnetic field detection element 21 than first portion 23a with respect to second direction Z. The second portion 23b has surface 23f that is opposite to interface 23d with the first portion 23a, surface 23f having a curved shape that protrudes in a direction away from the first portion 23a.