Record Details

Nonlinear spin wave magnetization of solution synthesized Ni nanoparticles

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Nonlinear spin wave magnetization of solution synthesized Ni nanoparticles
 
Creator VITTA, S
 
Subject molecular-beams
particles
nickel
microstructure
clusters
fe
co
 
Description The magnetic properties of Ni nanoparticles synthesized using a soft chemical method followed by heat treatment in H-2 atmosphere have been studied in detail. The powder consists of pure Ni with no additional phase and the average crystallite size is 30 +/- 5 nm, determined using the modified Scherer relation. The crystallites tend to agglomerate into large particles of sizes 50-100 nm, as observed by transmission electron microscopy. The saturation magnetization is found to be 46.42 emu g(-1) at 5 K, about 80% of the bulk magnetization value. The temperature dependence of saturation magnetization for T < 0.5T(C) is found to deviate from the linear Bloch's T-3/2 law indicating that spin wave interactions needs to be considered to understand the behavior. The spin wave stiffness constant obtained by fitting the saturation magnetization decay to a nonlinear spin wave model is lower by an order of magnitude compared to that of bulk Ni. The coercivity on the other hand decreases from 67 Oe at 5 K to 36 Oe at 300 K with a temperature dependence slower than the T-1/2 behavior predicted for noninteracting superparamagnetic particles. (c) 2007
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T10:04:56Z
2011-12-26T12:49:42Z
2011-12-27T05:35:19Z
2011-07-16T10:04:56Z
2011-12-26T12:49:42Z
2011-12-27T05:35:19Z
2007
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 101(6), -
0021-8979
http://dx.doi.org/10.1063/1.2710437
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4398
http://hdl.handle.net/10054/4398
 
Language en