CAJ | 학술논문

采用磁控溅射方法制备结构为CoFe/Cu/CoFe/IrMn的自旋阀结构多层膜,研究它的热弛豫现象.实验表明,多层膜在其负饱和场中等待时,钉扎层的磁滞回线向正场方向移动,交换偏置场单调减小,并且随温度升高而加速减小.交换偏置场的减小是由反铁磁层的反转引起的,它可以看作是反铁磁磁矩越过一定能垒的热激活反转过程.温度升高后,能垒的分布发生了改变.
채용자공천사방법제비결구위CoFe/Cu/CoFe/IrMn적자선벌결구다층막,연구타적열이예현상.실험표명,다층막재기부포화장중등대시,정찰층적자체회선향정장방향이동,교환편치장단조감소,병차수온도승고이가속감소.교환편치장적감소시유반철자층적반전인기적,타가이간작시반철자자구월과일정능루적열격활반전과정.온도승고후,능루적분포발생료개변.
Spin valve mutilayers with structure of CoFe/Cu/CoFe/IrMn was prepared by magnetron sputtering method and their thermal relaxation was studied. Results show that when holding in the negative saturation field, the hysteresis loop of the pinned ferromagnetic layer shifts towards the zero field and exchange bias field H_(ex) decreases monotonously, whose decay is enhanced by the temperature increasing. The decay is resulted from reversal of the antiferromagnetic layer, which can be considered as thermal activation reversal process of antiferromagnetic moment over some energy barrier; the distribution of the energy barrier changes in some way as the temperature increases.