Magnetization reversal asymmetry in [Co/Pt]/CoFe/IrMn multilayers with enhanced perpendicular exchange bias
Magnetization reversal asymmetry in [Co/Pt]/CoFe/IrMn multilayers with enhanced perpendicular exchange bias
复制标题
具有增强垂直交换偏压的 [Co/Pt]/CoFe/IrMn 多层膜中的磁化反转不对称性
DOI：
10.1063/1.4775837
复制
发表时间：
2013-01-21
影响因子：
3.2
通讯作者：
Cheng, Zhao-Hua
中科院分区：
文献类型：
--
作者：
Wu, Qiong;He, Wei;Cheng, Zhao-Hua
利用时间分辨表面磁光克尔效应和克尔显微镜研究了垂直交换偏置[Co/Pt]/Co 60 Fe 40/IrMn和[Co/Pt]/Co/IrMn多层膜的磁化反转.与[Co/Pt]/Co/IrMn在较小交换偏置场下的近对称反转相比，[Co/Pt]/Co 60 Fe 40/IrMn在较大交换偏置场下的非对称反转明显。非对称磁化反转的平均热激活能垒以及障碍的色散方面进行了讨论。界面层Co_（60）Fe_（40）取代Co层，使界面交换耦合增强，界面交换耦合绝对色散σ_（eint）增大，交换偏置场增大，反向不对称性增大。
The magnetization reversal of perpendicular exchange biased [Co/Pt]/Co60Fe40/IrMn and [Co/Pt]/Co/IrMn multilayers was investigated by time-resolved surface magneto-optical Kerr effect and Kerr microscopy. Compared with the nearly symmetric reversal of the [Co/Pt]/Co/IrMn with a smaller exchange bias field, significantly asymmetric domain evolution in the [Co/Pt]/Co60Fe40/IrMn with a larger exchange bias field was directly observed by Kerr microscopy. The asymmetric magnetization reversal is discussed in terms of the average thermally activated energy barriers as well as the dispersions of the barriers. The substitution of the interfacial Co60Fe40 layer for Co layer results in an enhancement of the interfacial exchange coupling eint and absolute dispersion of interfacial exchange coupling, σeint, and consequently increases the exchange bias field and reversal asymmetry.