Coexistence of the uniaxial anisotropy and the antiferromagnetic coupling in Co/Ir(111) superlattices
Coexistence of the uniaxial anisotropy and the antiferromagnetic coupling in Co/Ir(111) superlattices
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Co/Ir(111)超晶格中单轴各向异性与反铁磁耦合的共存
DOI：
10.1016/s0304-8853(02)01167-8
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发表时间：
2003
影响因子：
2.7
通讯作者：
E. Kita
中科院分区：
文献类型：
--
作者：
H. Itoh;H. Yanagihara;Katsutoshi Suzuki;E. Kita
我们研究了精心生长的Co/Ir（111）超晶格的结构和磁性，这些超晶格由每个元素的几个原子单层（MLs）组成。我们发现[Co(3ML)/Ir(3ML)]的超晶格具有垂直于表面的磁易轴，并且相邻Co层之间具有相当大的反铁磁耦合。结果，磁滞曲线在H ~ 53 kOe处显示自旋翻转。采用简单的两亚格相干旋转模型，分析了MH曲线，得到了AF耦合强度jaf和垂直各向异性K。[Co(3ML)/Ir(3ML)]（111）的K值甚至大于Co/Pt多层体系的K值，这是一种典型的强垂直各向异性体系。
We have investigated the structural and the magnetic properties of carefully grown Co/Ir(111) superlattices composed of a few atomic mono-layers (MLs) of each element. We found that the superlattice of [Co(3ML)/Ir(3ML)] has its magnetic easy-axis perpendicular to the surface and has quite large antiferromagnetic (AF) coupling between adjacent Co layers. As a result, the magnetic hysteresis curve shows a spin-flip at H∼53 kOe . Adopting a simple two sublattice coherent rotation model, we analyzed the MH curves and obtained the AF coupling strength JAFand the perpendicular anisotropy K as well. The estimated K of [Co(3ML)/Ir(3ML)](111) is even larger than that of Co/Pt multilayer which is known as a typical strong perpendicular anisotropy system.