IrMn基自旋阀结构多层膜的热弛豫研究  

Investigation of the Thermal Relaxation in IrMn-Based Spin Valve Multilayers

作　　者：陈杰[1] 王寅岗[1] 周广宏[1] 祁先进[1] 

机构地区：[1]南京航空航天大学,江苏南京210016

出　　处：《稀有金属材料与工程》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)

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.

关 键 词：热弛豫 IrMn基自旋阀 交换偏置场 磁化反转 

分 类 号：O482.53[理学—固体物理]