Optimization design for coercivity characteristic of spin valve Giant Magneto Resistance

With the rapid development and wide application of spin valve Giant Magneto Resistance (GMR) sensors, the improvement of the hysteresis characteristic is urgently required. Since the hysteresis is directly related with the coercivity of the structure of GMR sensor, a novel design method by pinning the end of the free layer is discussed in this paper. The theoretical model is established firstly. And then the numerical simulation is implemented. The effects of pinning shape and angle are all analyzed. Lastly, the principle of optimization design is achieved to improve the coercivity of GMR sensors. This method will be beneficial to reduce the hysteresis. Furthermore, it will also be helpful to improve the accuracy of spin valve GMR sensors.