Citation: ZHOU Xin-Wen, ZHANG Rong-Hua, SUN Shi-Gang. Magnetic Properties of CoPt Nanorods with Different Structures[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3360-3364. doi: 10.3866/PKU.WHXB20101125 shu

Magnetic Properties of CoPt Nanorods with Different Structures

1.
1. Department of Chemistry, College of Chemistry and Life Science, Three rges 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 Date: 4 June 2010
Available Online: 8 October 2010
Fund Project: 国家自然科学基金(20828005, 20833005)资助项目 (20828005, 20833005)

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 (T_B) 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.
- Superparamagnetic,
- CoPt,
- Nanorod,
- Magnetic property
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沈阳化工大学材料科学与工程学院沈阳 110142