Magnetic sensing device, method of forming the same,...

Details Magnetic sensing device, method of forming the same,... Magnetic sensing device, method of forming the same,...

2007-07-24

2007-07-24

Nguyen, Ha Tran (Department: 2829)

Electricity: measuring and testing

Magnetic

Magnetometers

Reexamination Certificate

active

11042094

ABSTRACT:
The present invention provides a magnetic sensing device capable of stably sensing a signal magnetic field with high sensitivity by suppressing occurrence of a hysteresis to reduce 1/f noise. A magnetic sensing device has a stacked body including a pinned layer having a magnetization direction pinned to a predetermined direction (Y direction), a free layer having a magnetization direction which changes according to an external magnetic field and, when the external magnetic field is zero, becomes parallel to the magnetization direction of the pinned layer, and an intermediate layer sandwiched between the pinned layer and the free layer. Consequently, as compared with the case where the pinned layer and the free layer have magnetization directions which are orthogonal to each other when the external magnetic field is zero, variations in the spin directions of magnetic domains in the free layer can be reduced. In the case of passing read current, appearance of a hysteresis in the relation between a change in the external magnetic field and a resistance change can be suppressed. As a result, 1/f noise is suppressed and a signal magnetic field can be stably sensed with high sensitivity.

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