Journal
NANOSCALE RESEARCH LETTERS
Volume 5, Issue 9, Pages 1474-1479Publisher
SPRINGEROPEN
DOI: 10.1007/s11671-010-9664-4
Keywords
Short-nanotubes; gamma-Fe2O3; Magnetic properties
Funding
- National Basic Research Program of China (973 Program) [2009CB939704]
- National Nature Science Foundation of China [10775109, 10905043]
- Specialized Research Fund for the Doctoral Program of Higher Education [20070486069]
- Young Chenguang Project of Wuhan City [200850731371, 201050231055]
- Specialized Research Fund for the Young Teacher of Wuhan University [1082010]
- Wuhan University [20082020201000008]
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We report a rational synthesis of maghemite (gamma-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 gamma-Fe2O3 SNTs are ferromagnetic, and its coercivity is nonzero when the temperature above blocking temperature (T (B)). The hysteresis loop was operated to show that the magnetic properties of gamma-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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