Patent ID: 7902811
Filing Date: 2011-03-08
Classification: G01R,H01L

Abstract:
1. A current sensor comprising: a conductor line having a V-shaped flat surface, the V-shaped flat surface being spread over a two-dimensional plane; and a pair of magnetoresistive elements disposed along with the conductor line so that a resistance value of one of the magnetoresistive elements changes in a direction opposite to that of resistance-value-change of the other magnetoresistive element according to current magnetic fields produced by a current to be detected flowing through the conductor line; and a pair of bias applying means, wherein one of the pair of magnetoresistive elements is disposed on a first arm portion of a pair of arm portions configuring a V shape of the conductor line, the other of the pair of magnetoresistive elements is disposed on a second arm portion of the pair of arm portions, and one side of the pair of magnetoresistive elements is disposed on one side of the first arm portion, and another side of the pair of magnetoresistive elements is disposed on one side of the second arm portion and detects the induction field induced by the current flowing through the opposing arm portions, and the pair of magnetoresistive elements includes: a pinned layer having a magnetization direction pinned to a direction; a free layer whose magnetization direction changes according to an external magnetic field, while the magnetization direction under no external magnetic field is parallel or antiparallel to a direction in which the conductor line is extending; and an intermediate layer inserted between the pinned layer and the free layer; and the magnetization direction of the pinned layer is parallel to the magnetization direction of the free layer when no external magnetic field is applied, and the pair of bias applying means each applying a bias magnetic field to each of the pair of magnetoresistive elements, respectively, the bias magnetic field having a parallel component parallel to the magnetization direction of the pinned layer and an orthogonal component orthogonal to the parallel component.