High Sensitivity Spin-tunneling Magnetic Sensor Using Oscillatory Domain Wall Displacement

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Magnetic sensors with wall displacement type have been developed by using giant magnetoresistance or spin tunneling effects. In order to reduce the influence of wall coercivity, which disturbs wall moving arising from an applied magnetic field, a new detection method in which the magnetic wall position was oscillatory modulated by alternative magnetic field was invented and the sensor devices composed by a magnetoresistive element and a conductor line for applying alternating field were developed. Consequently, the sensitivity for magnetic field was significantly improved compared to the conventional magnetic sensor with magnetization rotation mode.