中国物理B ›› 2009, Vol. 18 ›› Issue (2): 790-794.doi: 10.1088/1674-1056/18/2/063
王寅岗1, 祁先进1, 李子全1, 陈建康1, 周广宏2
Zhou Guang-Hong(周广宏)a)b), Wang Yin-Gang(王寅岗)a)†, Qi Xian-Jin(祁先进)a), Li Zi-Quan(李子全)a), and Chen Jian-Kang(陈建康)a)
摘要: In this paper, the magnetization reversal of the ferromagnetic layers in the IrMn/CoFe/AlOx/CoFe magnetic tunnel junction has been investigated using bulk magnetometry. The films exhibit very complex magnetization processes and reversal mechanism. Thermal activation phenomena such as the training effect, the asymmetry of reversal, the loop broadening and the decrease of exchange field while holding the film at negative saturation have been observed on the hysteresis loops of the pinned ferromagnetic layer while not on those of the free ferromagnetic layer. The thermal activation phenomena observed can be explained by the model of two energy barrier distributions with different time constants.
中图分类号: (Magnetization reversal mechanisms)