Hunton & Williams LLP
Magnetic sensor, method for manufacturing magnetic sensor, and current sensor
A magnetic sensor includes: a magnetoresistive effect element having a sensitivity axis in a specific direction in which a fixed magnetic layer, a nonmagnetic material layer, and a free magnetic layer are laminated in this order; an antiferromagnetic layer which generates an exchange coupling bias with the free magnetic layer and which aligns the magnetization direction thereof in a predetermined direction provided on the free magnetic layer; and a ferromagnetic layer which generates an exchange coupling bias with the antiferromagnetic layer and which aligns the magnetization direction thereof in a predetermined direction provided on the antiferromagnetic layer. The magnetization direction on the exchange coupling bias in the free magnetic layer is the same direction as that on the exchange coupling bias in the ferromagnetic layer, and the ferromagnetic layer is able to impart a reflux magnetic field having a component along a sensitivity axis to the free magnetic layer.
ALPS ELECTRIC CO., LTD.
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Masamichi Yosuke
Saito Ide