CoPt合金纳米有序阵列制备及热处理对其磁性的影响  

Preparation of CoPt Alloy Nanowire Arrays and the Influence of Heat Treatment on Its Magnetic Properties

作　　者：苏轶坤[1] 汤皎宁[1] 

机构地区：[1]深圳大学材料科学与工程系深圳市特种功能材料重点实验室,广东深圳518060

出　　处：《金属热处理》2006年第9期10-13,共4页Heat Treatment of Metals

基　　金：深圳大学科研基金(200623)

摘　　要：用电化学沉积法,在阳极氧化铝模板(AAO)中成功制备了直径为50 nm的CoPt合金纳米线的高度有序阵列。纳米线的结构和磁学特性分别用透射电子显微镜、扫描电子显微镜、X射线衍射仪和振动样品磁力计(VSM)测试。结果表明,CoPt合金纳米线是以fcc结构存在。当外加磁场与纳米线的线轴平行时,测得的矫顽力Hc为2400 Oe,剩磁比为0.75,而当外加磁场与纳米线线轴垂直时,所测得的矫顽力仅为600 Oe,剩磁比为0.25。这表明纳米线阵列具有明显的各向异性,纳米线的易轴方向为纳米线线轴方向。热处理过程中合金的微结构发生了变化,可以极大地提高材料的矫顽力。High orderly CoPt nanowires arrays with diameter of φ50 nm was fabricated successfully by electro-deposition in the anodic aluminum oxide （AAO） template. The structure and magnetic properties were characterized by TEM, SEM, XRD and vibrating sample magnetometer （VSM） , respectively. The results show the CoPt alloy nanowire arrays are fcc structure. The coercivity Hc is 2400 Oe and the remanence rate is about 0.75 when the applied field is parallel to the axis of CoPt nanowire arrays in as deposited sample. However, the coercivity Hc is only 600 Oe and the squareness is about 0.25 when applied field is perpendicular to the axis of CoPt nanowire arrays. The results indicate that nanowires have obvious anisotropy with their easy axis parallel to nanowire arrays. The coercivity of materials can be greatly improved by changing the CoPt alloy microstructure during heat treatment

关 键 词：阳极氧化铝模板 CoPt合金 热处理 

分 类 号：TG146[一般工业技术—材料科学与工程] TG132.2[金属学及工艺—金属材料]