The Anomalous Magnetic Exercise In The Vertical Exchange Bias Effect And Fev Alloys In The Anomalous Hall Effect Study

Albert Fert and Peter Grunberg discovered giant magnetoresistance effect in magnetic multilayers independently in 1998. Since then, magnetoelectronics, and spintronics caught the global attention. In the next decades, extensive studies including both theories and experiments have been carried out in this area.This thesis focuses on the base of spin-valve giant magnetoresistance - the exchange bias effect, and consists of three main parts:In the first part, glass/Ta/NiFe/CoFe/Cu/CoFe/IrMn/Ta spin valve is pre-pared by magnetron sputtering. The sample is characterized by standard 4-probe transport property measurement system and vibrating sample magnetometer. The results show that we have established typical spin-valve. By adjusting the NiFe and the copper layer thickness, a maximum magnetoresistance ratio of 8.0% is achieved.Second, the anomalous training effect is investigated in perpendicular ex-change biased Pt/Co/Pt/IrMn multilayers. The angular dependence of hysteresis loop is different from that of longitudinal exchange bias systems. By studying the coercivity, exchange bias field, and the training effect carefully, we believe that we have found a new and anomalous training effect due to the pinned domain wall motion magnetization reversal mechanism.In the last part, a tentative study of anomalous Hall effect in Fe1-xVx al-loy film is taken. We found that with the increasing of impurity vanadium, the temperature dependence of resistivity changes from the monotonic to the non-monotonic, while the anomalous Hall resistivity decreases. Moreover, this anoma-lous Hall effect and non-monotonic resistivity are suggested to be related with the phase transition from bcc (?) to non-crystal/nanocrystal phase, while employed high temperature annealing process and x-ray diffraction.