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
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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.
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Keywords:
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Superparamagnetic
, - CoPt,
- Nanorod,
- Magnetic property
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