MAGNETIC SENSOR DEVICE

• Main Authors: TAKAHASHI HIROKAZU, WATABE MORIYA
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• Subjects: ELECTRICITY; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To limit a reduction in detection accuracy of a magnetic sensor attributed to a magnetic hysteresis characteristic of a soft magnetic structure arranged near the magnetic sensor.SOLUTION: A magnetic sensor device 1 comprises a magnetic sensor 10 and a soft magnetic structure 40 arranged near the magnetic sensor. The magnetic sensor 10 and the soft magnetic structure 40 are configured so that when an external magnetic field including a detection magnetic field is applied on the magnetic sensor 10, the external magnetic field is also applied on the soft magnetic structure 40, and when the soft magnetic structure 40 has magnetization, a magnetic field based on the magnetization of the soft magnetic structure 40 is applied on the magnetic sensor 10. The soft magnetic structure 40 has a striped magnetic domain structure.SELECTED DRAWING: Figure 1 【課題】磁気センサの近傍に配置された軟磁性構造体の磁気ヒステリシス特性に起因した磁気センサの検出精度の低下を抑制する。【解決手段】磁気センサ装置１は、磁気センサ１０と、その近傍に配置された軟磁性構造体４０を備えている。磁気センサ１０と軟磁性構造体４０は、磁気センサ１０に検出対象磁界を含む外部磁界が印加されるときには軟磁性構造体４０にも外部磁界が印加され、軟磁性構造体４０が磁化を有するときには軟磁性構造体４０の磁化に基づく磁界が磁気センサ１０に印加されるように構成されている。軟磁性構造体４０は、縞状磁区構造を有している。【選択図】図１