Open Access Nano Express

Synthesis and Magnetic Properties of Maghemite (γ-Fe2O3) Short-Nanotubes

W Wu12, XH Xiao2, SF Zhang2, TC Peng2, J Zhou2, F Ren2 and CZ Jiang12*

Author Affiliations

1 Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, 430072, People’s Republic of China

2 Center for Electronic Microscopy and School of Physics and Technology, Wuhan University, Wuhan, 430072, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1474-1479  doi:10.1007/s11671-010-9664-4

Published: 17 June 2010

Abstract

We report a rational synthesis of maghemite (γ-Fe2O3) short-nanotubes (SNTs) by a convenient hydrothermal method and subsequent annealing process. The structure, shape, and magnetic properties of the SNTs were investigated. Room-temperature and low-temperature magnetic measurements show that the as-fabricated γ-Fe2O3 SNTs are ferromagnetic, and its coercivity is nonzero when the temperature above blocking temperature (TB). The hysteresis loop was operated to show that the magnetic properties of γ-Fe2O3 SNTs are strongly influenced by the morphology of the crystal. The unique magnetic behaviors were interpreted by the competition of the demagnetization energy of quasi-one-dimensional nanostructures and the magnetocrystalline anisotropy energy of particles in SNTs.

Keywords:
Short-nanotubes; γ-Fe2O3; Magnetic properties