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The Composition and Magnetic Structure of Fe<inf>3</inf>O<inf>4</inf>/γ-Fe<inf>2</inf>O<inf>3</inf> Core-Shell Nanocomposites under External Magnetic Field: Mössbauer Study (Part II)
Authors
Al-Omari I.A.
Kamzin A.S.
+3 more
Obaidat I.M.
Semenov V.G.
Valliulin A.A.
Publication date
1 January 2020
Publisher
Abstract
© 2020, Pleiades Publishing, Ltd. Abstract: The composition and the magnetic structure of Fe3O4/γ-Fe2O3 nanoparticles placed into external magnetic field with a strength of 1.8 kOe are studied with Mössbauer spectroscopy. We showed that the thickness of the maghemite (γ-Fe2O3) shell can be changed by the synthesis conditions. We found that there is a layer, in which the magnetic moments are not oriented collinearly to those located in the depth of the shell, on the surface of maghemite (γ-Fe2O3) shell in the Fe3O4/γ-Fe2O3 nanocomposites; in other words, there is a canted spin structure. An intermediate layer in the spin-glass state is formed between the core and the shell. The data on structure of core/shell particles are important to understand the properties of nanocomposites, which are of great interest to apply in various fields, including biomedicine
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Last time updated on 03/05/2021