Anantharaman, M R; Vamsi Krishna, G; Philip, Kurian(2013)
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Abstract:
Ferrite composites are magnetic composites consisting of fine particles of metal
ferrites dispersed in the polymer matrix. These composites have a variety of applications as
flexible magnets, pressure/photo sensors and microwave absorbers. Polymers and
magnetic materials play a very important role in our day to day life. Both natural and
synthetic polymers are today indispensable to mankind. The polymers, which include
rubber, plastics and fibers, make life easier and more comfortable.
Anantharaman, M R; Malini, K A; Sindhu, S; Sindhu, P D; Keer, H V(PUBLICATIONS & INFORMATION DIRECTORATE, CSIR, November , 1999)
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Abstract:
Preparatiun or aci cular maghemi te containing dopan ls li ke Mg. i and Gd and their characleris,llion us ing different analytica l
techniques have been reported. These in vestigat ions reveal that the addition of dopants li ke Mg. Ni and Gd modifies the magnetic
properties without cfrecting any structural changes. The opt ical bandgaps of these doped compositions have ,li S() hecn
determ ined. Evidence is ,li so av,li lab le from spectroscopic investi gations suggest ing thalmaghcllli te prepared vi,l the ()xa l,ltc
precursor route does nm exhi bit a hydrogen fe rrite structure
Description:
Ind ian Joum,ll of Pure & Applied Phys ics
Vol. 37. November 1999. pr. 842-847
Anantharaman, M R; Swapna, Nair S; Francis, Xavier; Joy, P A; Kulkarni, S D(Elsevier, September 20, 2007)
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Abstract:
Ferrofluids belonging to the series NixFe1 xFe2O4 were synthesised by two different procedures—one by standard co-precipitation
techniques, the other by co-precipitation for synthesis of particles and dispersion aided by high-energy ball milling with a view to
understand the effect of strain and size anisotropy on the magneto-optical properties of ferrofluids. The birefringence measurements were
carried out using a standard ellipsometer. The birefringence signal obtained for chemically synthesised samples was satisfactorily fitted to
the standard second Langevin function. The ball-milled ferrofluids showed a deviation and their birefringence was enhanced by an order.
This large enhancement in the birefringence value cannot be attributed to the increase in grain size of the samples, considering that the
grain sizes of sample synthesised by both modes are comparable; instead, it can be attributed to the lattice strain-induced shape
anisotropy(oblation) arising from the high-energy ball-milling process. Thus magnetic-optical (MO) signals can be tuned by ball-milling
process, which can find potential applications
Description:
Journal of Magnetism and Magnetic Materials 320 (2008) 815–820
Anantharaman, M R; Sagar, S(Springer, January 31, 2011)
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Abstract:
Materials belonging to the family of manganites are technologically important since they exhibit colossal
magneto resistance. A proper understanding of the transport properties is very vital in tailoring the properties. A
heavy rare earth doped manganite like Gd0·7Sr0·3MnO3 is purported to be exhibiting unusual properties because
of smaller ionic radius of Gd. Gd0·7Sr0·3MnO3 is prepared by a wet solid state reaction method. The conduction
mechanism in such a compound has been elucidated by subjecting the material to low temperature d.c. conductivity
measurement. It has been found that the low band width material follows a variable range hopping (VRH) model
followed by a small polaron hopping (SPH) model. The results are presented here
Description:
Bull. Mater. Sci., Vol. 35, No. 1, February 2012, pp. 41–45.