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Magnetic orientation of iron films produced by laser-deposition

激光沉积产生的铁膜的磁取向

基本信息

批准号：
17550066
负责人：
YAMADA Yasuhiro
金额：
$ 2.11万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17550066/
关键词：
Laser-deposition Iron films Mossbauer spectroscopy Magnetic orientation Spin anisotropy

项目摘要

Iron films deposited on Al substrates were investigated using Mossbauer spectroscopy and scanning electron microscopy. It was found that the nuclear spin orientation of iron films produced by deposition of Fe atoms vaporized by resistive heating was perpendicular to the substrate surface, while that of films produced by laser deposition of Fe was parallel to the substrate surface. The droplets produced by laser deposition have a disk-like shape and perturb the spin orientation of the film. We have demonstrated that the spin orientation of Fe films can be controlled by employing different deposition methods.Pyrite (FeS_2) and hematite (Fe_2O_3) were laser-deposited on Al or SiO_2/Si substrates. Mossbauer spectra of the samples provided information on composition of the laser-deposited films. The samples produced at higher temperatures have compositions with fewer amounts of S atoms to have magnetic FeS, whereas the samples produced at low temperatures have compositions close to FeS_2. In both cases, samples with defects in the lattice structure were obtained. A SiO_2/Si substrate was found to stabilize FeS_2 phase better than an Al substrate. From SEM images, it was observed that droplet particles which reflect the as-deposited composition of FeS_2 were obtained at a lower temperature. The preliminary results on laser-deposition of Fe_2O_3 show that FeO and Fe_2O_3 particles with a very high density of crystal defects were produced. It was shown that laser-deposition of compounds can produce films that have different chemical species than the laser-evaporated materials. It was also shown that yields of product compounds in films vary depending on the temperature of the substrate.

用穆斯堡尔谱和扫描电子显微镜研究了沉积在Al衬底上的铁膜。结果表明，电阻加热蒸发Fe原子沉积的铁膜的核自旋取向垂直于衬底表面，而激光沉积的铁膜的核自旋取向平行于衬底表面。通过激光沉积产生的液滴具有盘状形状并且扰动膜的自旋取向。我们在Al或SiO_2/Si衬底上激光沉积了黄铁矿（FeS_2）和赤铁矿（Fe_2O_3）铁膜，并在此基础上研究了不同沉积方法对铁膜自旋取向的控制。样品的穆斯堡尔谱提供了激光沉积膜的组成信息。在较高温度下制备的样品的组成中S原子含量较少，从而具有磁性FeS，而在低温下制备的样品的组成接近FeS_2。在这两种情况下，获得了在晶格结构中具有缺陷的样品。SiO_2/Si衬底比Al衬底更能稳定FeS_2相。从SEM图像中观察到，在较低的温度下获得了反映FeS_2沉积组成的液滴颗粒。激光沉积Fe_2O_3的初步研究结果表明，生成的FeO和Fe_2O_3颗粒具有很高的晶体缺陷密度。结果表明，激光沉积的化合物可以产生薄膜，具有不同的化学物种比激光蒸发的材料。它还表明，在薄膜中的产物化合物的产率取决于基板的温度。