Mössbauer Studies of the Structure of Core/Shell Fe3O4/γ-Fe2O3 Nanoparticles


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Abstract

The phase composition, the structure of cores and shells, and the dependences of the shell thickness on the fabrication technique were determined by Mössbauer spectroscopy for core/shell Fe3O4/γ-Fe2O3 magnetic nanoparticles (MNPs) with Fe3O4 cores of a fixed size (8 nm) and γ-Fe2O3 shells of a varying thickness (1, 3, or 5 nm). A layer on the MNP surface with a magnetic state differing from that in the bulk was found. It was also found that a spin-glass state probably exists between the core and the shell. The studied core/shell Fe3O4/γ-Fe2O3 MNPs have promising applications in various fields (e.g., biomedicine).

About the authors

A. S. Kamzin

Ioffe Physical Technical Institute, Russian Academy of Sciences

Author for correspondence.
Email: ASKam@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

I. M. Obaidat

Department of Physics, United Arab Emirates University

Email: ASKam@mail.ioffe.ru
United Arab Emirates, Al-Ain

A. A. Valliulin

Kazan Federal University

Email: ASKam@mail.ioffe.ru
Russian Federation, Kazan, 420008

V. G. Semenov

St. Petersburg State University

Email: ASKam@mail.ioffe.ru
Russian Federation, St. Petersburg, 199034

I. A. Al-Omari

Department of Physics, Sultan Qaboos University

Email: ASKam@mail.ioffe.ru
Oman, Muscat

C. Nayek

Department of Physics, United Arab Emirates University

Email: ASKam@mail.ioffe.ru
United Arab Emirates, Al-Ain

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