铁钴合金纳米线有序阵列的制备及其磁性表征

用电化学法制备了高度有序的多孔阳极氧化铝（AAO）模板，选摩尔比为1：1的CoSO4和FeSO4混合溶液为电解液，用交流电化学沉积法在多孔阳极氧化铝的柱形微孔内制备Fe0.5 Co0.5合金磁性纳米线有序阵列．分别用扫描电镜、透射电镜、X射线衍射仪对多孔氧化铝模板和纳米线阵列的微观形貌和结构进行分析，用振动样品磁强计（VSM）对样品的磁学性能进行测试．结果显示，制备的磁性合金纳米线表面光滑、均匀，纳米线中的晶粒在生长过程中有（200）晶面的择优取向．VSM测试结果表明，纳米线阵列结构具有较高的垂直磁各向异性，当外场沿纳米线轴向磁化时，纳米线阵列有很大的剩磁比（Mr／Ms=0．7）和很大的矫顽力（饱和Hc=1700 Oe），说明样品经适当热处理后，剩磁比和纵向矫顽力普遍得到提高．

Synthesis and Magnetic Properties of FeCo Alloy Nanowire Arrays in Porous Alumina Template

Highly ordered porous anodic aluminum oxide (AAO) membranes were prepared by electrochemical method.By alternating current electrodepositing,FeCo alloy nanowire arrays were fabricated in the porous alumina template in a mixed electrolyte of CoSO_4 and FeSO_4.The microstructures of membranes and nanowire arrays were characterized by XRD,TEM and VSM.The results show that the Fe_(0.5)Co_(0.5) nanowire arrays get uniform and regular with a preferred crystal face(200) during growing,a highly perpendicular magnetic anisotropy with remnant magnetization ratio 0.7 and coercivity(1 700 Oe) for applied field paralleled to the nanowire arrays is demonstrated.A proper heat treatment enables to greatly enhance the coercivity and remnant magnetization ratio.