交流电沉积频率对Fe-Co纳米线阵列的成分和磁性能的影响(英文)

AC electrodeposition frequency dependence of composition and magnetic properties of Fe-Co nanowire arrays

采用交流电沉积方法于不同频率在氧化铝模板中合成了线间距50nm、直径22nm的Fe—Co合金纳米线阵列，研究了沉积频率对阵列成分、晶体结构以及磁性能的影响．研究发现：Fe—Co纳米线阵列的最佳沉积频率范围为5-350Hz．在此范围内合成的阵列，其晶体结构对沉积频率的依赖并不明显，但成分与磁性能却会受到沉积频率的影响．阵列磁性能随频率的变化趋势可以用纳米线饱和磁化强度与线间静磁耦合作用的改变来定性解释．氢气退火后，所有阵列均具有良好的磁性能．它们的矫顽力和矩形度分别高于3．512kOe和0．939．其中，50Hz沉积的阵列磁性能相对最好．热磁分析表明：其居里温度约为630℃．

Fe-Co alloy nanowire arrays with the interwire distance of about 50 nm and the wire diameter of about 22 nm were fabricated by alternating current electrodeposition at different frequencies into anodic aluminum oxide templates. The influences of the deposition frequency on the composition, crystalline structure and magnetic properties of the arrays were studied in detail. It was found that the deposition frequency for the Fe-Co alloy nanowire arrays has an optimal range of 54350 Hz. For the arrays prepared within this range, the deposition frequency has no obvious influence on their crystalline structure, while it does affect the array＇s composition and magnetic properties. The variations for the nanowire＇s saturation magnetization and the magnetostatic interaction between nanowires were employed to explain the change in the array＇s magnetic properties with the deposition frequency qualitatively. After annealing in hydrogen atmosphere, all the arrays fabricated within the optimal frequency range have fairly good magnetic properties. Their coercivities and squarenesses are higher than 3. 512 kOe and 0. 939, respectively. The array deposited at 50 Hz possesses the comparatively best hard magnetic performance. The thermomagnetic analysis indicates that its Curie temperature is about 630 ℃.