高性能Fe-Co合金有序纳米线阵列的制备与磁性研究

Preparation and Magnetic Properties of Ordered Fe-Co Alloy Nanowire Array with High Performance

采用两步电化学阳极氧化方法制备了有序多孔氧化铝模板,通过交流电化学沉积方法在模板中合成了线间距约为62nm、直径约为25nm的Fe48Co52合金纳米线阵列,细致研究了阵列的晶体结构与磁性能.研究表明:沉积态阵列具有体心立方结构.氢气退火处理对阵列的晶体结构没有影响,但是会显著提高阵列的磁性能.退火后,Fe-Co合金纳米线阵列显示了较高的永磁性能,其易磁化方向的矫顽力、矩形度以及单根纳米线的最大磁能积分别约为3.63kOe、0.971以及33.7mol/dm3GOe.

Fe48 Co52 alloy nanowire arrays with the interwire distance of about 62 nm and the wire diameter of about 25 nm are fabricated by alternating current electrodeposition into ordered porous anodic aluminum oxide templates synthesized via a two-step electrochemical anodization process. The crystalline structure and the magnetic properties of the arrays are investigated in detail. The paper finds that the as-deposited array possesses a body-centred-cubic structure. The treatment of annealing the array in the hydrogen atmosphere has no obvious influence on the array＇s crystalline structure, while improvs the array＇s magnetic properties greatly. After annealing, the Fe-Co alloy nanowire array shows a good permanent magnetic performance. Its coercivity, squareness, and the maximum energy product for single nanowire are as high as 3.63 kOe, 0. 971, and 33.7 tool/dm^3 GOe, respectively.