By Topic

Dynamic Magnetic Properties of NiFe _{2} O _{4} Nanoparticles Embedded in SiO _{2} Matrix

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Mitra, S. ; S. N. Bose Nat. Centre for Basic Sci., Kolkata ; Mandal, K. ; Eun Sang Choi

NiFe2O4 nanoparticles with average sizes of 3.5(plusmn0.4) nm, 5.0(plusmn0.5) nm, and 19(plusmn1.1) nm embedded in the SiO2 matrix were prepared by the sol-gel method. Size and temperature dependence of magnetic relaxation of the ferrite nanoparticles were studied. A classical logarithmic distribution function was considered to analyze the thermally activated relaxation phenomenon in the nanocomposites, but it cannot describe the behavior within the whole range of temperatures and times. An alternative more general approach called T ln(t /tau0) scaling was used to generate master curves which allows one to extrapolate the relaxation behavior at times that are experimentally inaccessible. The mean energy barrier as well as the width, sigma of the energy distribution curves can also be estimated from this study. These results are in good agreement with those obtained from ac and dc susceptibility measurements.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )