摘要
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。
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^x 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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第12期2175-2178,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50671048)
关键词
热弛豫
IrMn基自旋阀
交换偏置场
磁化反转
thermal relaxation
IrMn-based spin valve
exchange bias field
magnetization reversal
