Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Interparticle Interaction Effects in the Magnetic Properities NiO Nanorods

Published

Author(s)

M Seehra, H Shim, P Dutta, A Manivannan, John E. Bonevich

Abstract

Magnetic properties of sol-gel synthesized 5 nm nanorods of NiO, with and without oleic acid coating to affect interparticle interactions, are reported. Particle morphologies were studied by transmission electron microscopy and temperature variations (5 K to 300 K) of the magnetization and electron magnetic resonance (EMR) spectra at 9.28 GHz were measured to determine the respective blocking temperatures Tb(m) and Tb(emr). For these particles with magnetic moment/particle 1200 B, following differences are noted: (i) Tb(m) is reduced from 230 K (uncoated) to 90 K (coated) for H = 2.5 mT (25 Oe); (ii) Decrease of Tb(m) with applied field H is much weaker for the uncoated particles and (iii) the ratio Tb(emr)/Tb(m) is smaller for the uncoated particles. These differences are interpreted in terms of the stronger interparticle interaction present in the uncoatedparticles.
Citation
Journal of Applied Physics
Volume
97

Keywords

electron microscopy, magnetic properties, nanoparticles

Citation

Seehra, M. , Shim, H. , Dutta, P. , Manivannan, A. and Bonevich, J. (2005), Interparticle Interaction Effects in the Magnetic Properities NiO Nanorods, Journal of Applied Physics (Accessed February 25, 2024)
Created April 30, 2005, Updated October 12, 2021