| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for detecting magnetic fields, in which a switching offset of a magnetic field sensor is suppressed to the minimum and the magnetic field sensor is nonvolatile, and the electric power loss is small. SOLUTION: The magnetic device (300) comprises a pinning layer (310), and moreover, comprises a plurality of ferromagnetic layers (322, 324, 326). At least one of a plurality of the ferromagnetic layers is adjacent to the pinning layer (310). A spacer layer (340) is adjacent to at least another of a plurality of the ferromagnetic layers. A sense layer (330) is adjacent to the spacer layer (340). The respective thicknesses of a plurality of the ferromagnetic layers (322, 324, 326) are formed so that a Neel magnetic field between the sense layer (330) and a plurality of the ferromagnetic layers (322, 324, 326) may be in the opposite direction to demagnetizing field between a plurality of the ferromagnetic layers (322, 324, 326) and the sense layer (330). COPYRIGHT: (C)2005,JPO&NCIPI
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