Journal
JOURNAL OF APPLIED PHYSICS
Volume 108, Issue 8, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3499289
Keywords
-
Categories
Funding
- Chinese National Foundation of Natural Science [10974148]
- National Science Fund for Talent Training in Basic Science [J0830310]
- 973 Program [2009CB939705]
- Wuhan University [5082003]
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials (Hubei University)
Ask authors/readers for more resources
Cobalt ferrite nanoparticles were synthesized via the hydrothermal route with the addition of trisodium citrate dihydrate (Na(3)CA center dot 2H(2)O). The characterizations including x-ray diffraction (XRD) and transmission electron microscope showed that the products of this hydrothermal reaction are composed of cobalt ferrite nanocrystallite and a small amount of FeOOH, and the average crystallite size of the nanoparticles is 7.6 +/- 0.3 nm by XRD. The magnetic measurements revealed the temperature-dependent magnetic properties: The superparamagnetism occurs above 380 K due to the overcoming of energy barrier for the flip of spins, which arises from the magnetocrystalline anisotropy energy and the interparticle interactions due to the aggregation of the nanoparticles; a frozen spin-glasslike state was observed below 20 K, which is accompanied with the decrease in coercivity and high-field paramagnetic susceptibility, as well as the enhancement of saturated magnetization and the effective magnetic anisotropy constant. (C) 2010 American Institute of Physics. [doi:10.1063/1.3499289]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available