CoxCu1-x复相纳米线阵列的制备及其磁性的研究  

Fabrication and magnetic properties of Co_xCu_(1-x) composite nanowire arrays

作　　者：刘晓旭[1] 陈贵锋[2] 李养贤[2] 徐世峰[3] 吴光恒[3] 徐秋[1] 王鸿雁[1] 刘宝海[1] 师宏伟[1] 王冀霞[1] 赵郁海[1] 

机构地区：[1]河北科技师范学院数理系,秦皇岛066004 [2]河北工业大学材料学院,天津300130 [3]中国科学院物理研究所北京凝聚态物理国家实验室,北京100190

出　　处：《物理学报》2008年第7期4527-4533,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50472034,50471056)资助的课题~~

摘　　要：利用电化学沉积方法在同一种富Co2+溶液Co2+/Cu2+=10∶1中,利用不同的沉积电位成功地制备了一系列不同成分(x=0.38—0.87)和复合相结构的CoxCu1-x纳米线阵列.发现随着纳米线中Cu含量的变化,CoxCu1-x纳米线的复相结构随之发生规律的变化,最终导致纳米线的磁性也随之规律的变化.随着纳米线中Cu含量的不断增加,一部分Cu与Co形成面心立方结构(fcc)的CoCu固溶体,减弱了磁晶各向异性与形状各向异性的竞争,从而提高样品的方形度;一部分Cu以fcc结构的Cu单质的形式存在于纳米线中,并随着Cu颗粒大小的不同分别起到破坏磁晶各向异性和钉扎畴壁的作用,从而增加纳米线的方形度和矫顽力.对比不同成分的样品,发现CoxCu1-x纳米线的方形度和矫顽力的最大值分别出现在Co75Cu25和Co60Cu40中,并且由于其特殊的复相结构致使它们的值要好于相同直径的单相结构的结果.A series of composite structured Cox Cu1-x （ x = 0.38--0.87） nanowlre arrays have been successlully deposited in the same Co2＋/Cu2＋ = 10：1 solution by applying various depositing potentials. We found that the structures of Cox Cul_x composite nanowires regularly changed with increase of Cu content, thus causing regular change of the magnetic properties of CoCu nanowires. With the percent content of Cu increasing, part of Cu and Co form metastable face-centred cubic （fcc） CoCu solid solution which decreases the competition between the crystallographic anisotropy and shape anisotropy and improves the squareness of CoCu nanowires; the remaining part of Cu exists in the nanowires as fcc Cu crystals which destroy the crystallographic anisotropy and increases the pinning of domain walls, thus improves the squareness and coercivity of CoCu nanowires. Comparing Cox Cu1-x, nanowires of different compositions, we found that the nanowires have their maximum of the squareness （Mr/Ms） and coercivity （He） values for Co75 Cu25 and Co060 Cu40, respectively. Because of the special composite structures, the values exceed those of single phase CoCu nanowire with the same diameter.

关 键 词：纳米线 电化学沉积 磁性 

分 类 号：TB383.1[一般工业技术—材料科学与工程]