发明授权
- 专利标题： Magnetic field detector, and current detection device, position detection device and rotation detection devices using the magnetic field detector
- 专利标题（中）： 磁场检测器，电流检测装置，位置检测装置和使用磁场检测器的旋转检测装置
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申请号： US12098291申请日： 2008-04-04
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公开(公告)号： US07508203B2公开(公告)日： 2009-03-24
- 发明人: Takashi Takenaga , Hiroshi Kobayashi , Takeharu Kuroiwa , Sadeh Beysen , Taisuke Furukawa
- 申请人： Takashi Takenaga , Hiroshi Kobayashi , Takeharu Kuroiwa , Sadeh Beysen , Taisuke Furukawa
- 申请人地址： JP Tokyo
- 专利权人： Mitsubishi Electric Corporation
- 当前专利权人： Mitsubishi Electric Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权： JP2004-043248 20040219
- 主分类号： G01R33/09
- IPC分类号： G01R33/09 ; G01R33/05 ; G01B7/30
摘要：
A magnetic field detector having a reference magnetoresistive element and a magnetic field detecting magnetoresistive element. The reference magnetoresistive element and the magnetic field detecting magnetoresistive element each has a stack structure including an antiferromagnetic layer, a fixed layer of a ferromagnetic material with the direction of magnetization fixed by the antiferromagnetic layer, a nonmagnetic layer, and a free layer of a ferromagnetic material with the direction of magnetization adapted to be changed by an external magnetic field. The reference magnetoresistive element is such that the direction of magnetization of the fixed layer and the direction of magnetization of the free layer in the nonmagnetic field are parallel or antiparallel to each other, and the magnetic field detecting magnetoresistive element is such that the direction of magnetization of the fixed layer and the direction of magnetization of the free layer in the nonmagnetic field are different from each other. Thus, it is possible to provide a magnetic field detector capable of singly calibrating the sensitivity and the resolution of the detector whenever required.