To tune the coercivity of Fe-filled carbon-nanotube (CNT) arrays, the shape anisotropy of encapsulated Fe nanoparticles (Fe-NPs) was investigated. Four Fe-filled CNT-array samples with different Fe-NP aspect ratios were prepared by catalytic pyrolysis of acetylene using ferrocene as catalyst. The coercivity of the Fe-filled CNT arrays increased from similar to 300 to similar to 800 Oe at room temperature when the mean aspect ratio of the encapsulated Fe-NPs changed from 1.6 to 6.0. This clear dependence of the coercivity of the Fe-filled CNT arrays on the aspect ratio of the Fe-NPs might be interpreted in terms of the Stoner-Wohlfarth model. This result indicates that changing the shape anisotropy of the encapsulated Fe-NPs is an effective method to tune the coercivity of the Fe-filled CNTs. (C) 2008 American Institute of Physics.
部门归属
[shi, c. x.; cong, h. t.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;shi, cx (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;htcong@imr.ac.cn
C. X. Shi,H. T. Cong. Tuning the coercivity of Fe-filled carbon-nanotube arrays by changing the shape anisotropy of the encapsulated Fe nanoparticles[J]. Journal of Applied Physics,2008,104(3).
APA
C. X. Shi,&H. T. Cong.(2008).Tuning the coercivity of Fe-filled carbon-nanotube arrays by changing the shape anisotropy of the encapsulated Fe nanoparticles.Journal of Applied Physics,104(3).
MLA
C. X. Shi,et al."Tuning the coercivity of Fe-filled carbon-nanotube arrays by changing the shape anisotropy of the encapsulated Fe nanoparticles".Journal of Applied Physics 104.3(2008).
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