Superparamagnetism and spin-glass like state for the MnFe2O4 nano-particles synthesized by the thermal decomposition method |
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| Authors: | Ruo-Rui Gao Yue Zhang Wei Yu Rui Xiong Jing Shi |
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| Affiliation: | 1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, PR China;2. Department of Electric Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;3. Key Laboratory for the Green Preparation and Application of Functional Materials of Ministry of Education, Hubei University, Wuhan 430062, PR China;4. International Center for Material Physics, Shen Yang 110015, PR China |
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| Abstract: | MnFe2O4 nano-particles with an average size of about 7 nm were synthesized by the thermal decomposition method. Based on the magnetic hysteresis loops measured at different temperatures the temperature-dependent saturation magnetization (MS) and coercivity (HC) are determined. It is shown that above 20 K the temperature-dependence of the MS and HC indicates the magnetic behaviors in the single-domain nano-particles, while below 20 K, the change of the MS and HC indicates the freezing of the spin-glass like state on the surfaces. By measuring the magnetization–temperature (M–T) curves under the zero-field-cooling (ZFC) and field-cooling procedures at different applied fields, superparamagnetism behavior is also studied. Even though in the ZFC M–T curves peaks can be observed below 160 K, superparamagnetism does not appear until the temperature goes above 300 K, which is related with the strong inter-particle interaction. |
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| Keywords: | MnFe2O4 nano-particle Superparamagnetism Spin-glass like state Thermal decomposition |
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