MBE growth and magneto-optic properties of magnetic multilayers
MBE growth and magneto-optic properties of magnetic multilayers
复制标题
磁性多层膜的MBE生长和磁光特性
DOI：
10.1016/0169-4332(92)90514-x
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发表时间：
1993
影响因子：
6.7
通讯作者：
B. Engel
中科院分区：
文献类型：
--
作者：
C. Falco;B. Engel
过渡金属/过渡金属多层膜的磁性和磁光性质近来受到了人们的关注，因为在Co/Pd和Co/Pt等特殊体系中发现了垂直磁性。由于其良好的磁光波长依赖性和增强的耐腐蚀性，这些材料有望成为未来的数据存储介质。然而，部分由于薄膜沉积方法和生长条件的多样性，人们很难对这些系统中的磁各向异性的机制有一个清楚的了解。为了建立可控和表征良好的模型体系，我们用分子束外延[MBE]的方法在单晶GaAs衬底上生长了一系列沿[001]、[110]和[111]三个高对称性晶体方向取向的Co/Pd外延超晶格。同时，我们在硅衬底上沉积了多晶Co/Pd多层膜，用于直接比较在相同条件下制备的外延和非外延薄膜。用低反射高能电子衍射(LEED和RHEED)、低角和高角X射线衍射和扫描隧道显微镜(STM)确定了这些多层膜的结构性质。这些超晶格中的单轴磁各向异性能量与Co厚度的关系在三种晶体取向上都表现出显著的系统差异。回顾了我们在造成这些差异的结构性影响方面的工作。
Recent interest in the magnetic and magneto-optic properties of transition metal/transition metal multilayers has been stimulated by the discovery of perpendicular magnetism in particular systems such as Co/Pd and Co/Pt. Due to their favorable magneto-optic wavelength dependence and enhanced corrosion resistance, these materials show promise as future data storage media. However, partially due to the large variety of thin-film deposition methods and growth conditions, it has been difficult to obtain a clear understanding of the mechanisms of magnetic anisotropy in these systems. In order to create controlled and well characterized model systems, we have grown a series of epitaxial Co/Pd superlattices oriented along the three high-symmetry crystal directions [001], [110], and [111] on single-crystal GaAs substrates by molecular beam epitaxy [MBE]. Simultaneously, we have deposited polycrystalline Co/Pd multilayers on Si substrates mounted alongside the GaAs for direct comparisons of epitaxial and non-epitaxial films produced under identical conditions. The structural properties of these multilayers were determined by low-and reflection high-energy electron diffraction (LEED and RHEED), low- and high-angle X-ray diffraction, and scanning tunneling microscopy (STM). The dependence of the uniaxial magnetic anisotropy energy on the Co thickness in these superlattices showed significant systematic differences for each of the three crystal orientations. A review of our work on the structural influences responsible for these differences is presented.