Tuning the magnetic coupling across ultrathin antiferromagnetic films by controlling atomic-scale roughness
Tuning the magnetic coupling across ultrathin antiferromagnetic films by controlling atomic-scale roughness
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DOI：
10.1038/nmat1548
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发表时间：
2006-02-01
期刊：
影响因子：
41.2
通讯作者：
Kirschner, J
中科院分区：
文献类型：
--
作者：
Kuch, W;Chelaru, LI;Kirschner, J
在原子水平上表征和控制界面结构和形貌是详细了解反铁磁材料与相邻铁磁材料之间磁相互作用的重要问题，因为反铁磁体中的原子自旋在最近原子距离的长度尺度上改变方向。尽管它对开发先进的磁性数据存储设备和广泛的研究具有重要的技术意义，但反铁磁体和铁磁体之间的磁界面耦合的细节仍然被隐藏。本文给出了单晶铁磁体-反铁磁体三层膜的磁光克尔效应测量和层分辨光谱显微磁域成像的结果。界面形态的原子级控制是通过系统地改变底部铁磁层和反铁磁层的厚度来实现的。我们发现，界面上的磁耦合是由单原子高度的台阶边来调节的，而原子上的耦合是由台阶边来调节的。在一些地区没有贡献。
Characterization and control of the interface structure and morphology at the atomic level is an important issue in understanding the magnetic interaction between an antiferromagnetic material and an adjacent ferromagnet in detail, because the atomic spins in an antiferromagnet change direction on the length scale of nearest atomic distances. Despite its technological importance for the development of advanced magnetic data-storage devices and extensive studies, the details of the magnetic interface coupling between antiferromagnets and ferromagnets have remained concealed. Here we present the results of magneto-optical Kerr-effect measurements and layer-resolved spectro-microscopic magnetic domain imaging of single-crystalline ferromagnet - antiferromagnet ferromagnet trilayers. Atomic-level control of the interface morphology is achieved by systematically varying the thicknesses of the bottom ferromagnetic and the antiferromagnetic layer. We find that the magnetic coupling across the interface is mediated by step edges of single-atom height, whereas atomically. at areas do not contribute.