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Enhanced Room-Temperature Ferromagnetism Observed in SiO2-Coated CuO Nanostructures

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Abstract

In this paper, the magnetic properties of pure CuO and SiO2-coated CuO nanocrystals were reported. Strongly enhanced room-temperature ferromagnetism was observed in SiO2-coated CuO nanocrystals, whose saturation magnetization is two orders of magnitude enhanced compared to that of the uncoated CuO nanocrystals. The mechanism of this enhancement was investigated. It points out the main origin of ferromagnetism in these CuO nanocrystals is the uncompensated surface state, so that the coating of SiO2 can effectively protect the surface state to improve the ferromagnetism in these CuO nanocrystals.

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Abbreviations

FM:

Ferromagnetic

AFM:

Antiferromagnetic

HMTA:

Hexamethylenetetramine

XRD:

X-ray diffraction

STEM:

Scanning transmission electron microscopy

HRTEM:

High-resolution transmission electron microscopy

FC:

Field cooled

ZFC:

Zero field cooled

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Funding

This work is supported by the Higher Educational Science and Technology Program of Shandong Province, China (Grant No. J16LJ02); Natural Science Foundation of Shandong Province, China (ZR2016GM26); and the Key Laboratory of Public Security Management Technology in Universities of Shandong (Shandong Management University).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Shandong Management University, Jinan, 250357, People’s Republic of China

    Xiaofang Bian

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  1. Xiaofang Bian
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Correspondence to Xiaofang Bian.

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Bian, X. Enhanced Room-Temperature Ferromagnetism Observed in SiO2-Coated CuO Nanostructures. J Supercond Nov Magn 31, 3685–3689 (2018). https://doi.org/10.1007/s10948-018-4635-6

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  • DOI: https://doi.org/10.1007/s10948-018-4635-6

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