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Memory effect up to room-temperature in Ni/Ni2P core-shell structured nanoparticles

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Abstract

Memory effect has been studied in the system using magnetic nanoparticles with Ni nanocore encapsulated by non-magnetic and oxidation-resistant Ni2P nanoshell acquired through surface-phosphatizing Ni nanoparticles. The self-assembled array with interparticle spacing of about 6 nm shows memory effect up to 200 K below its average blocking temperature of 260 K. And reducing the interparticle spacing of the self-assembled array via annealing can further enlarge the temperature range of memory effect up to room-temperature. The memory effect can be understood based on the thermal relaxation theory of single-domain magnetic nanoparticles. Furthermore, the read-write magnetic coding is realized based on the temperature changes, using the memory effect up to room-temperature, which may be useful for future memory devices.

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Authors and Affiliations

  1. School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Hanning Duan  (段寒凝), Songliu Yuan, Xianfeng Zheng & Zhaoming Tian

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  1. Hanning Duan  (段寒凝)
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  2. Songliu Yuan
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  3. Xianfeng Zheng
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  4. Zhaoming Tian
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Correspondence to Hanning Duan  (段寒凝).

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Funded by the National Natural Science Foundation of China (No. 11174092)

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Duan, H., Yuan, S., Zheng, X. et al. Memory effect up to room-temperature in Ni/Ni2P core-shell structured nanoparticles. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 28, 467–470 (2013). https://doi.org/10.1007/s11595-013-0714-5

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  • DOI: https://doi.org/10.1007/s11595-013-0714-5

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