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

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Author(s): Wu W | Xiao XH | Zhang SF | Peng TC | Zhou J | Ren F | Jiang CZ

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 9;
Start page: 1474;
Date: 2010;
Original page

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

ABSTRACT
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.
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