Superparamagnetic behavior of antiferromagnetic CuO nanoparticles
Journal
IEEE Transactions on Magnetics
Journal Volume
41
Journal Issue
10
Pages
3409-3411
Date Issued
2005
Author(s)
Abstract
We report on the magnetic properties of CuO nanoparticles prepared by the sol-gel method. M (T) curves show a blocking temperature at T/sub B/=135 K and 160 K for 13 nm and 17 nm size particles, respectively, in measuring field H=100 Oe. The M-H data for both the samples show a reversal magnetization at 300 K, whereas below T/sub B/ it exhibit symmetrical hysteresis loops with a coercive field of 200 Oe (155 Oe) and a remanence 0.306 emu/mole (0.171 emu/mole) for 13 nm (17 nm) at 5 K. Presence of superparamagnetism and net magnetic moments of CuO nanoparticles are attributed to the uncompensated Cu/sup 2+/ions at the surface of the particles.
Type
journal article