Kumaresavanji M, Gomes I T, Apolinario A, Rolo A G, Almeida B G, Lopes A M L, Araujo J P
IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Porto, Portugal.
Nanotechnology. 2016 Mar 29;27(12):125303. doi: 10.1088/0957-4484/27/12/125303. Epub 2016 Feb 18.
Highly ordered nanohole arrays of [Formula: see text] manganite have been synthesized using pulsed laser deposition on nanoporous alumina template. Their structure and phase formation were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive x-ray spectroscopy (EDX) and x-ray diffraction (XRD). The magnetic measurements were performed with respect to temperature and field and exhibit a ferromagnetic to paramagnetic transition at 284 K. In addition, the temperature dependence of electrical resistance was measured at different magnetic fields and an insulating phase throughout all the temperatures was observed. The low temperature ferromagnetic insulating state is discussed by the presence of a canted ferromagnetic state induced by the nanoholes. The present work shows the feasibility of combining both the nanoporous alumina template and pulsed laser ablation for the fabrication of perovskite manganite nanohole arrays which can also be extended to fabricate other multicomponent oxide nanohole materials.
通过脉冲激光沉积在纳米多孔氧化铝模板上合成了具有高度有序纳米孔阵列的[化学式：见原文]锰氧化物。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）、能量色散X射线光谱（EDX）和X射线衍射（XRD）对其结构和相形成进行了表征。针对温度和磁场进行了磁性测量，结果显示在284 K时发生铁磁到顺磁转变。此外，在不同磁场下测量了电阻的温度依赖性，并观察到在所有温度下均存在绝缘相。通过纳米孔诱导的倾斜铁磁态的存在来讨论低温铁磁绝缘态。目前的工作表明了结合纳米多孔氧化铝模板和脉冲激光烧蚀来制造钙钛矿锰氧化物纳米孔阵列的可行性，这也可以扩展到制造其他多组分氧化物纳米孔材料。
