Journal
MATERIALS RESEARCH BULLETIN
Volume 46, Issue 12, Pages 2468-2473Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.08.033
Keywords
Magnetic materials; Nanostructures; Magnetic properties; Magnetic structure
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Funding
- The Sectorial Operational Programme for the Development of Human Resources in Romania [POSDRU/6/1.5/S/25, POSDRU/89/1.5/S/49944]
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In this paper we present the magnetic properties of mesoporous silica-coated Fe3O4 nanoparticles. The coating of magnetite nanoparticles with mesoporous silica shell was performed under ultrasonic irradiation. The obtained mesoporous silica-coated magnetite nanoparticles were characterized by powder X-ray diffraction, focused ion beam-scanning electron microscopy, nitrogen adsorption-desorption isotherms and vibrating sample magnetometer. The hysteretic behavior was studied using first-order reversal curves diagrams. The X-ray diffraction result indicates that the extreme chemical and physical conditions created by acoustic cavitations have an insignificant effect on crystallographic structural characteristic of magnetite nanoparticles. Changes in the coercivity distributions of the magnetite nanoparticles were observed on the first-order reversal curves diagrams for the samples with coated particles compared with the samples containing uncoated particles of magnetite. The coated particles show an increased most probable coercivity of about 20% compared with the uncoated particles which can be associated with an increased anisotropy due to coating even if the interaction field distribution measured on the diagrams are virtually identical for coated/uncoated samples. (C) 2011 Elsevier Ltd. All rights reserved.
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