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Title The Role of Interactions in Systems of Single Domain Ferrimagnetic Iron Oxide Nanoparticles
Authors Dutz, Silvio
Hergt, Rudolf
ORCID
Keywords Magnetic interactions
Packing density
Coercivity
Magnetic nanoparticles
Magnetite
Type Article
Date of Issue 2012
URI http://essuir.sumdu.edu.ua/handle/123456789/27781
Publisher Сумський державний університет
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Citation Silvio Dutz, Rudolf Hergt, J. Nano-Electron. Phys. 4 No 2, 02010 (2012)
Abstract Magnetic nanoparticles are interesting materials for a lot of medical and technical applications. A less experimentally investigated question is the influence of particle packing density on magnetic properties due to magnetic interactions between single particles. For this, magnetic nanoparticles of iron oxides prepared as fine dry powder by laser deposition are investigated with respect to their structural and magnetic properties as function of packing density. The particles are nearly spherically shaped single crystals in the magnetic single domain size range with a mean diameter of 21 nm occasionally exhibiting spinel growth facets. Powders of these particles are diluted by nonmagnetic silicon oxide particles in a range of volume concentrations from 0.2 % up to 68 % of the bulk density of magnetite. The concentration dependence of remanence, coercivity and hysteresis losses is determined by measurements of minor loops in a vibrating sample magnetometer. Results which are discussed in the frame of present theoretical models may be understood in terms of the cubic anisotropy of magnetite distorted by a small uniaxial shape contribution. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/27781
Appears in Collections: Журнал нано- та електронної фізики (Journal of nano- and electronic physics)

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