Alotaibi Shuaa, Samba Joshua, Pokharel Sabin, Lan Yucheng, Uradu Kelechi, Afolabi Ayodeji, Unlu Ilyas, Basnet Gobind, Aslan Kadir, Flanders Bret N, Lisfi Abdellah, Ozturk Birol
Department of Physics, Morgan State University, 1700 East Cold Spring Lane, Baltimore, Maryland 21215, USA.
Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA.
Appl Phys Lett. 2018 Feb 26;112(9):092401. doi: 10.1063/1.4997310.
AC electric fields were utilized in the growth of individual high-aspect ratio cobalt nanowires from simple salt solutions using the Directed Electrochemical Nanowire Assembly method. Nanowire diameters were tuned from the submicron scale to 40 nm by adjusting the AC voltage frequency and the growth solution concentration. The structural properties of the nanowires, including shape and crystallinity, were identified using electron microscopy. Hysteresis loops obtained along different directions of an individual nanowire using vibrating sample magnetometry showed that the magnetocrystalline anisotropy energy has the same order of magnitude as the shape anisotropy energy. Additionally, the saturation magnetization of an individual cobalt nanowire was estimated to be close to the bulk single crystal value. A small cobalt nanowire segment was grown from a conductive atomic force microscope cantilever tip that was utilized in magnetic force microscopy (MFM) imaging. The fabricated MFM tip provided moderate quality magnetic images of an iron-cobalt thin-film sample.
利用交流电电场，通过定向电化学纳米线组装方法，从简单盐溶液中生长出具有高纵横比的单个钴纳米线。通过调节交流电压频率和生长溶液浓度，将纳米线直径从亚微米尺度调整到40纳米。使用电子显微镜确定了纳米线的结构特性，包括形状和结晶度。使用振动样品磁强计沿着单个纳米线的不同方向获得的磁滞回线表明，磁晶各向异性能量与形状各向异性能量具有相同的数量级。此外，估计单个钴纳米线的饱和磁化强度接近体单晶值。从用于磁力显微镜（MFM）成像的导电原子力显微镜悬臂尖端生长出一小段钴纳米线。制造的MFM尖端提供了铁钴薄膜样品的中等质量磁图像。
