Apparently enhanced magnetization of Cu(I)-modified γ-Fe2O3 based nanoparticles

Xiaoyan Qiu, Zhenghong He, Hong Mao, Ting Zhang, Yueqiang Lin, Xiaodong Liu, Decai Li, Xiangshen Meng and Jian Li ()
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Xiaoyan Qiu: School of Physical Science and Technology, Southwest University
Zhenghong He: School of Physical Science and Technology, Southwest University
Hong Mao: School of Physical Science and Technology, Southwest University
Ting Zhang: School of Physical Science and Technology, Southwest University
Yueqiang Lin: School of Physical Science and Technology, Southwest University
Xiaodong Liu: School of Physical Science and Technology, Southwest University
Decai Li: State Key Laboratory of Tribology, Tsinghua University
Xiangshen Meng: School of Physical Science and Technology, Southwest University
Jian Li: School of Physical Science and Technology, Southwest University

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 11, 1-8

Abstract: Abstract Using a chemically induced transition method in FeCl2 solution, γ-Fe2O3 based magnetic nanoparticles, in which γ-Fe2O3 crystallites were coated with FeCl3⋅6H2O, were prepared. During the synthesis of the γ-Fe2O3 nanoparticles Cu(I) modification of the particles was attempted. According to the results from both magnetization measurements and structural characterization, it was judged that a magnetic silent “dead layer”, which can be attributed to spin disorder in the surface of the γ-Fe2O3 crystallites due to breaking of the crystal symmetry, existed in the unmodified particles. For the Cu(I)-modified sample, the CuCl thin layer on the γ-Fe2O3 crystallites incurred the crystal symmetry to reduce the spin disorder, which “awakened” the “dead layer” on the surface of the γ-Fe2O3 crystallites, enhancing the apparent magnetization of the Cu(I)-modified nanoparticles. It was determined that the surface spin disorder of the magnetic crystallite could be related to the coating layer on the crystallite, and can be modified by altering the coating layer to enhance the effective magnetization of the magnetic nanoparticles.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80264-7

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