Synthesis and magnetic properties of nickel nanoparticles deposited on the silicon nanowires |
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Authors: | Zhiliang Wang Junyu ZhuXuejiao Chen Qiang YanJian Zhang Yun Chen |
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Affiliation: | a Department of Electronic Engineering, Key Laboratory of Polar Materials and Devices (Ministry of Education of China), East China Normal University, 500 Dongchuan Road, Shanghai 200241, China b School of Electronics and Information, Nantong University, 9 Seyuan Road, Nantong 226019, China |
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Abstract: | Nickel (Ni) nanoparticles with sizes of ∼35 nm were deposited on the surface of silicon nanowires (SiNWs) by electroless plating technique. The magnetic properties of Ni/SiNWs were investigated. The blocking temperature (TB) of 370 K was obtained and confirmed by field-cooled (FC) and zero-field-cooled (ZFC) plots. The M-H hysteresis loops from 5 K to 400 K were measured. The saturation magnetization value was ∼4.5 emu/g and the coercivity was ∼375.3 Oe for the loop at 5 K, respectively. While for the loop at 400 K, these values were of ∼2.6 emu/g and ∼33.3 Oe, respectively. The temperature dependence of coercivity followed by the relation HC(T) = HC01 − (T/TB)1/2], indicating a superparamagnetic behavior. The magnetization of superparamagnetic grains in a magnetic field H was better described by Langevin function at 400 K. These novel magnetic properties of Ni/SiNWs were possibly attributed to the paramagnetic defects on the surface of SiNWs. |
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Keywords: | SiNWs Nickel nanoparticles Paramagnetic defects Superparamagnetic Magnetic properties |
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