Magnetic and structural properties of Fe‐FeO bilayers
Magnetic and structural properties of Fe‐FeO bilayers
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Fe-FeO双层的磁性和结构特性
DOI：
10.1063/1.358217
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
S. Shah
中科院分区：
文献类型：
--
作者：
X. Lin;A. Murthy;G. Hadjipanayis;C. Swann;S. Shah
通过X射线光电子能谱（XPS）、卢瑟福背散射光谱、透射电子显微镜和超导量子干涉装置研究了溅射Fe/Fe-O薄膜的结构和磁性能。 XPS 研究表明，制成的样品表面存在 FeO 和 Fe2O3。微观结构研究显示出均匀的纳米结构，晶粒尺寸在 50-150 A 范围内，较小的晶粒对应于更薄的薄膜。研究发现，随着薄膜厚度减小到 60 A 以下，10 K 时的矫顽力大幅增加。在厚度约为 20 A 的样品中观察到高 Hc (2.7 kOe)。磁化曲线显示出平面各向异性，并具有 Fe 和 Fe-O 涂层之间交换各向异性的移动磁滞回线特征。发现矫顽力随着温度的升高而急剧下降。这可能归因于 Fe-O 表面层的超顺磁性行为。
The structural and magnetic properties of sputtered Fe/Fe‐O films were studied by x‐ray photoelectron spectroscopy (XPS), Rutherford backscattering spectroscopy, transmission electron microscopy, and superconducting quantum interference device. XPS studies showed the presence of FeO and Fe2O3 on the surface of as‐made samples. Microstructure studies showed a uniform nanostructure with the grain size in the range of 50–150 A with smaller grains corresponding to thinner films. The coercivity at 10 K was found to increase substantially with decreasing film thickness below 60 A. A high Hc (2.7 kOe) was observed in samples with a thickness about 20 A. Magnetization curves showed a planar anisotropy with a shifted hysteresis loop characteristic of an exchange anisotropy between the Fe and Fe‐O coating. The coercivity was found to drop steeply with increasing temperature. This may be attributed to the superparamagnetic behavior of the Fe‐O surface layer.