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Electrical and magnetic properties of nanocrystalline Fe100-xNix alloys

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Title Electrical and magnetic properties of nanocrystalline Fe100-xNix alloys
 
Creator VITTA, S
KHUNTIA, A
RAVIKUMAR, G
BAHADUR, D
 
Subject ni phase-diagram
fe-ni
temperature-dependence
nanoparticles
particles
microstructure
resistivity
moments
state
size
nanoparticles
electronic transport
magnetic properties
 
Description The electrical and magnetic properties of nanocrystalline binary Fe100-xNix alloys, where x ranges from 0 to 100, prepared by a combination of aqueous and solid-state reduction processes have been studied vis-a-vis their microstructure. The microstructural studies indicate the formation of near-equilibrium phases in the alloys with crystallite size in the range 20-40 nm. The crystallite size in the case of pure Fe and Ni, however, is in the range 40-80 nm. The electrical transport in the temperature range 20-300K exhibits a typical ferromagnetic metallic behavior in all the cases and the absolute resistivity of nanocrystalline Fe100-xNix alloys decreases monotonically with increasing Ni content. The saturation magnetization of the alloys on the other hand decreases progressively with Ni addition towards that of pure Ni value. The coercivity of alloys is found to be independent of temperature in the range 5-300K except in the case of pure Ni wherein it increases from 30 Oe at 300K to 65Oe at 5 K. The electrical and magnetic properties of the nanocrystaline Fe-Ni alloys do not follow the predictions of simple itinerant band model for alloys. The temperature dependence of saturation magnetization in all the cases has a T-3/2 Bloch variation while the average atomic moment of the alloys has an effective medium composition dependence. (C) 2007
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-24T22:26:04Z
2011-12-26T12:48:27Z
2011-12-27T05:38:59Z
2011-07-24T22:26:04Z
2011-12-26T12:48:27Z
2011-12-27T05:38:59Z
2008
 
Type Article
 
Identifier JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 320(3-4), 182-189
0304-8853
http://dx.doi.org/10.1016/j.jmmm.2007.05.021
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6557
http://hdl.handle.net/10054/6557
 
Language en