中文摘要：

利用溶胶—凝胶法制备了（Fe Pt）100Cu0,（Fe Pt）95Cu5,（Fe Pt）90Cu10纳米颗粒.通过XRD、TEM、VSM等测试方法对样品的磁性及形貌结构进行了表征,并阐释了掺杂Cu元素对Fe Pt合金的影响.研究发现,Cu原子取代了Fe Pt合金中Fe或Pt原子的位置,但Cu掺杂并没有破坏有序相Fe Pt合金的结构.随着Cu掺杂浓度的提高,样品的矫顽力增大但是磁化强度减小.和未掺杂Cu的纯Fe Pt纳米颗粒相比,Cu的掺杂降低了Fe Pt的有序化温度,增加了样品的有序化程度.（Fe Pt）90Cu10纳米颗粒的矫顽力为7 050 Oe,而（Fe Pt）100Cu0纳米颗粒的矫顽力提高到了9 746 Oe.

英文摘要：

In this paper,we prepared（ Fe Pt）100Cu0,（ Fe Pt）95Cu5and（ Fe Pt）90Cu10NPs by sol-gel method,respectively. Characterizations of these particles were achieved by using XRD,TEM and VSM. The magnetic properties and structures of（ Fe Pt）100Cu0,（ Fe Pt）95Cu5and（ Fe Pt）90Cu10nanoparticles（ NPs） were studied. The results showed that the Cu ions substituted for the position of Fe or Pt ions in the Fe Pt alloys. However,Cu doping did not destroy the ordered structure of L10-Fe Pt. With the increase of Cu content,the coercivity increased and magnetization decreased. Cu doping reduced the Fe Pt alloys phase transition temperature from FCT to FCC structure and promoted the chemical ordering of L10 Fe Pt NPs.（ Fe Pt）90Cu10NPs have a coercivity value of around9 746 Oe. This is in contrast to the 7 050 Oe of the Fe Pt NPs prepared in the absence of Cu.