物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3360-3364.doi: 10.3866/PKU.WHXB20101125

材料物理化学 上一篇    下一篇

不同结构CoPt纳米棒磁学性能

周新文1, 张荣华1, 孙世刚2   

  1. 1. 三峡大学化学与生命科学学院化学系, 湖北 宜昌 443002;
    2. 厦门大学化学化工学院化学系, 固体表面物理化学国家重点实验室, 福建 厦门 361005
  • 收稿日期:2010-06-04 修回日期:2010-07-19 发布日期:2010-12-01
  • 通讯作者: 周新文, 孙世刚 E-mail:xwzhou@ctgu.edu.cn, sgsun@xmu.edu.cn
  • 基金资助:

    国家自然科学基金(20828005, 20833005)资助项目

Magnetic Properties of CoPt Nanorods with Different Structures

ZHOU Xin-Wen1, ZHANG Rong-Hua1, SUN Shi-Gang2   

  1. 1. Department of Chemistry, College of Chemistry and Life Science, Three Gorges University, Yichang 443002, Hubei Province, P. R. China;
    2. State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2010-06-04 Revised:2010-07-19 Published:2010-12-01
  • Contact: ZHOU Xin-Wen, SUN Shi-Gang E-mail:xwzhou@ctgu.edu.cn, sgsun@xmu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20828005, 20833005).

摘要:

运用电位置换结合化学还原方法制备了两种不同结构的CoPt 纳米棒材料, 一种为实心结构(CoPt?a),一种为空心结构(CoPt?b). 采用透射电镜(TEM)和能量散射光谱(EDS)研究了其形貌和组成. 在5和300 K下测试了两种纳米棒的磁学性能. 结果显示, CoPt?a和CoPt?b纳米棒在5 K时的矫顽力分别为6.5和9.3 A·m-1, 温度升至300 K时, 两种结构CoPt纳米棒矫顽力均减小为0 A·m-1. 场冷曲线(FC)和零场冷曲线(ZFC)结果表明两种结构的CoPt纳米棒均表现出超顺磁性, 阻塞温度(TB)分别为10.0和9.0 K. 两种CoPt纳米棒组成、结构等不同可能是引起其矫顽力、磁化强度和阻塞温度差异的主要原因.

关键词: 超顺磁性, CoPt, 纳米棒, 磁学性能

Abstract:

We prepared two kinds of CoPt nanorods by galvanic displacement reaction and chemical reduction. One type was solid (CoPt?a) and the other was hollow (CoPt?b). Transmission electron microscopy (TEM) and energy?dispersive X?ray spectroscopy (EDS) were used to characterize the shape and composition of the nanorods. The magnetic properties were measured at 5 and 300 K. The coercivities of the CoPt?a and CoPt?b nanorods were found to be 6.5 and 9.3 A·m-1 at 5 K, respectively. The coercivities decreased to 0 A·m-1 when the temperature was increased to 300 K. The field cooling (FC) and zero field cooling (ZFC) curves indicated that both the CoPt?a and CoPt?b nanorods are superparamagnetic. The blocking temperatures (TB) of CoPt ?a and CoPt ?b are 10.0 and 9.0 K, respectively. The different magnetic properties of the two kinds of CoPt nanorods including coercivity, magnetization, and blocking temperature may be due to their different compositions and structures.

Key words: Superparamagnetic, CoPt, Nanorod, Magnetic property

MSC2000: 

  • O646