NDLI: Superparamagnetism and interparticle interactions in ZnFe<sub>2</sub>O<sub>4</sub> nanocrystals

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Back cover

Journal of Materials Chemistry Vol - 22 Issue - 6

Journal of Materials Chemistry Vol - 22 Issue - 5

Journal of Materials Chemistry Vol -19

Journal of Materials Chemistry Vol -9

Journal of Materials Chemistry Vol -8

Journal of Materials Chemistry Vol -7

Journal of Materials Chemistry Vol -6

Journal of Materials Chemistry Vol -5

Journal of Materials Chemistry Vol -4

Journal of Materials Chemistry Vol -3

Superparamagnetism and interparticle interactions in ZnFe₂O₄ nanocrystals

Content Provider	Royal Society of Chemistry (RSC)
Author	Blanco-Gutierrez, Veronica Torralvo-Fernandez, María J. Saez-Puche, Regino
Copyright Year	2012
Abstract	ZnFe2O4 particles ranging from 4 to 19 nm have been prepared by a solvothermal method. They exhibit superparamagnetic behavior above the blocking temperature which takes a value from 14 to 62 K, magnetization values from 30 to 60 emu g−1, an anisotropy constant that ranges from 1.1 × 105 to 3.4 × 105 erg cm−3 and an effective superparamagnetic moment from 7.0 × 102 to 8.6 × 103μB. The superparamagnetic behavior is affected by the presence of dipolar interparticle interactions which are deeply influenced by the synthesis conditions. These interactions yield a wider ZFC maximum and a higher blocking temperature. Moreover, other kinds of interparticle interactions have been found to take place at low temperature and occur through frozen surface spins. Whereas the dipole interactions reduce the anisotropy of the system, the surface spin interactions tend to increase it and the material becomes magnetically harder.
Starting Page	2992
Ending Page	3003
Page Count	12
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	7
Journal	Journal of Materials Chemistry
DOI	10.1039/c1jm14856g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Superparamagnetism Anisotropy Erg Zermelo\u2013Fraenkel set theory Dipole
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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