A study of the effect of iron island morphology and interface oxidation on the magnetic hysteresis of Fe-MgO (001) thin film composites
A study of the effect of iron island morphology and interface oxidation on the magnetic hysteresis of Fe-MgO (001) thin film composites
复制标题
铁岛形貌和界面氧化对Fe-MgO(001)薄膜复合材料磁滞的影响研究
DOI：
10.1063/1.4730630
复制
发表时间：
2012
影响因子：
3.2
通讯作者：
M. Taheri
中科院分区：
文献类型：
--
作者：
S. Spurgeon;J. Sloppy;Runzhe Tao;R. Klie;S. Lofland;J. Baldwin;A. Misra;M. Taheri
Fe-MgO 隧道结因其在硬盘驱动器读取头和其他自旋电子应用中的使用而受到广泛关注。该系统因其磁阻行为及其组成元素的丰富性和低成本而特别令人感兴趣。然而，关于 Fe-MgO 界面的结构和化学性质如何介导磁性行为，仍然存在许多问题。在这项研究中，我们报告了不同形貌的 Fe-MgO 复合薄膜的透射电子显微镜、电子能量损失谱和磁性表征。我们探索了薄膜形态、混合及其对磁性结构的影响之间的关系。我们发现 Fe-MgO 界面处存在氧化，对复合材料的饱和磁化强度产生不利影响。我们还观察了矫顽力和磁晶各向异性随薄膜形态和厚度的变化。这些结果将为 MgO 基隧道结的设计提供信息，并提高我们的理解......
Fe-MgO tunnel junctions have received much attention for their use in hard drive read heads and other spintronic applications. The system is particularly interesting because of its magnetoresistive behavior and the abundance and low cost of its constituent elements. However, many questions remain about how the structure and chemistry of the Fe-MgO interface mediates magnetic behavior. In this study, we report on transmission electron microscopy, electron energy loss spectroscopy, and magnetic characterization of Fe-MgO composite films with various morphologies. We explore relationships between film morphology, intermixing, and the resulting effects on magnetic structure. We find the presence of oxidation at the Fe-MgO interface, with a detrimental impact on the saturation magnetization of the composite. We also observe changes in coercivity and magnetocrystalline anisotropy with film morphology and thickness. These results will inform the design of MgO-based tunnel junctions and improve our understanding ...