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Magnetic properties of α-Fe2O3 nanopallets

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Abstract

It is the result of a systemic study about uniform hematite nanopallets with length of about 100 nm, width of about 30 nm, and thickness of less than 10 nm. The sample has superparamagnetic (SPM) properties above the blocking temperature of ~16 K. The temperature dependence of magnetization was well fitted by Bloch T3/2 law considering the dipolar interaction of the particles. The field dependence of magnetization was fitted with revised Langevin equation. The magnetization of the weak ferromagnetic (WF) canted spins contributes to the linear portion in the high field region; the surface uncompensated spins and the parasitic ferromagnetic moments due to the canted spins both contribute to the particle moments and the superparamagnetic behavior.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 11674023, 51371015, 51331002, and 51501004) and Beijing Municipal Science and Technology Project (No. Z17111000220000).

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Authors and Affiliations

  1. Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, 100083, Beijing, China

    Ying-Ying Xu & Rong-Ming Wang

  2. Department of Equipment Manufacture, Zhongshan Torch Polytechnic, 528436, Zhongshan, China

    Long Wang

  3. Division of Energy and Environmental Measurement, National Institute of Metrology, 100013, Beijing, China

    Tong Wu

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  1. Ying-Ying Xu
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  2. Long Wang
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Correspondence to Long Wang.

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Xu, YY., Wang, L., Wu, T. et al. Magnetic properties of α-Fe2O3 nanopallets. Rare Met. 38, 14–19 (2019). https://doi.org/10.1007/s12598-017-0938-1

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  • DOI: https://doi.org/10.1007/s12598-017-0938-1

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