NDLI: Magnetic interactions in ball-milled spinel ferrites

Content Provider	Springer Nature Link
Author	Goya, G. F.
Copyright Year	2004
Abstract	Spinel Fe$_{3}$O$_{4}$ nanoparticles have been produced through ball milling in methyl-alcohol (CH$_{3}$OH) with the aim of producing samples with similar average particle sizes (d) and different interparticle interactions. Three samples with the Fe$_{3}$O$_{4}$ to CH$_{3}$(OH) mass ratios R of 3, 10 and 50 wt% were milled for several hours until particle size reached a steady value (d) ∼6-10 nm). A detailed study of static and dynamic magnetic properties has been undertaken by measuring magnetization, ac susceptibility and Mössbauer data. As expected for small particles, the Verwey transition was not observed, but instead superparamagnetic (SPM) behavior was found with transition to a blocked state at T $_{B}$ ∼10-20 K. For samples having 3 wt% of magnetic particles, dynamic ac susceptibility measurements show a thermally activated Arrhenius dependence of the blocking temperature with applied frequency. This behavior is found to change as interparticle interactions begin to rule the dynamics of the system, yielding a spin-glass-like state at low temperatures for R = 50 wt% sample.
Starting Page	5045
Ending Page	5049
Page Count	5
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	39
Issue Number	16-17
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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