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Retraction published on 29 March 2017, see Nanomaterials 2017, 7(4), 73.

Open AccessArticle

Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles

Centre for High Energy Physics, University of the Punjab, Lahore 54000, Pakistan
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Centre for Excellence in Solid State Physics, University of the Punjab, Lahore 54000, Pakistan
Nanomaterials Research Group, Physics Division PINSTECH, Nilore, Islamabad 45650, Pakistan
Department of Physics, Forman Christian College, Lahore 54000, Pakistan
Author to whom correspondence should be addressed.
Academic Editor: Yurii Gun’ko
Nanomaterials 2016, 6(4), 72;
Received: 22 December 2015 / Revised: 30 January 2016 / Accepted: 5 February 2016 / Published: 14 April 2016
(This article belongs to the Special Issue Recent Advances in Nanomaterials’ Research: Selection from ICSSP'15)
PDF [1410 KB, uploaded 29 March 2017]


Bimagnetic monodisperse CoFe2O4/Fe3O4 core/shell nanoparticles have been prepared by solution evaporation route. To demonstrate preferential coating of iron oxide onto the surface of ferrite nanoparticles X-ray diffraction (XRD), High resolution transmission electron microscope (HR-TEM) and Raman spectroscopy have been performed. XRD analysis using Rietveld refinement technique confirms single phase nanoparticles with average seed size of about 18 nm and thickness of shell is 3 nm, which corroborates with transmission electron microscopy (TEM) analysis. Low temperature magnetic hysteresis loops showed interesting behavior. We have observed large coercivity 15.8 kOe at T = 5 K, whereas maximum saturation magnetization (125 emu/g) is attained at T = 100 K for CoFe2O4/Fe3O4 core/shell nanoparticles. Saturation magnetization decreases due to structural distortions at the surface of shell below 100 K. Zero field cooled (ZFC) and Field cooled (FC) plots show that synthesized nanoparticles are ferromagnetic till room temperature and it has been noticed that core/shell sample possess high blocking temperature than Cobalt Ferrite. Results indicate that presence of iron oxide shell significantly increases magnetic parameters as compared to the simple cobalt ferrite. View Full-Text
Keywords: core/shell nanoparticles; Rietveld refinement; surface effects; FC/ZFC core/shell nanoparticles; Rietveld refinement; surface effects; FC/ZFC

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nairan, A.; Khan, U.; Iqbal, M.; Khan, M.; Javed, K.; Riaz, S.; Naseem, S.; Han, X. Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles. Nanomaterials 2016, 6, 72.

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