C M Srivastava
Articles written in Bulletin of Materials Science
Volume 1 Issue 1 May 1979 pp 49-57 Research Communications
A detailed study of permeability spectra of polycrystalline pure and Aland Gd-Substituted garnets has been carried out for different values of grain diameter and magnetisation. The spectra are of three types—resonance, relaxed and mixed. It has been shown that the resonance spectra occur when the closure demains are absent and the domain wall is anchored at the grain boundary. The relaxed spectrum is found for domains having closure flux while the mixed spectrum is an indication of simulataneous presence of grains with and without closure domains.
Volume 1 Issue 2 October 1979 pp 95-98 Articles
The experimental solid state physics group at the Indian Institute of Technology, Bombay, has been engaged in research on ferromagnetic resonance and relaxation, magnetic ordering and exchange phenomena in ferrimagnetic systems. A brief report on the facilities developed and the work done by the magnetism group is presented.
Volume 3 Issue 2 July 1981 pp 185-191 Biswas Memorial Symposium On The Chemistry And Physics of Solids, Magnetism And Magnetic Properties Of Materials
The exchange constants obtained using the three sublattice model for ferrites and garnets have been analysed using Anderson’s theory of superexchange. The transfer integrals for the 180° and 90° interactions obtained from the experimental values of exchange constants give approximate values of the covalency parameters which are consistent with the chemical theory of covalency.
Volume 3 Issue 2 July 1981 pp 225-233 Biswas Memorial Symposium On The Chemistry And Physics of Solids, Magnetism And Magnetic Properties Of Materials
The influence of a Jahn-Teller ion on magnetization,
Volume 5 Issue 3-4 August 1983 pp 247-256
The origin of Verwey transition in magnetite is investigated. It is shown that the transport properties in the high temperature phase of magnetite can be accounted by a phonon-induced correlated electron transfer mechanism. Assuming that the condensation of this phonon mode leads to Verwey transition, the isotope and pressure effects have been explained. The electron energy band diagram consistent with the electrical transport behaviour in the low temperature phase has been constructed.
Volume 6 Issue 1 February 1984 pp 7-12
The presence of small amounts of Fe2+ ion in nickel zinc ferrite significantly influences some of its magnetic properties. The lattice parameter increases slightly and the increase Δ
Volume 6 Issue 1 February 1984 pp 17-20
The Mössbauer spectroscopy of polycrystalline Y3−
Volume 6 Issue 1 February 1984 pp 27-31
A detailed analysis of the available experimental data has been made for the ordered phase of ZnFe2O4. The abnormally low
Volume 6 Issue 1 February 1984 pp 65-70
The dependence of microstructure on sintering conditions during hot pressing have been investigated and the densification mechanisms have been used to explain the observed results. The effect of addition of excess ZnO content over stoichiometry on permeability has been studied in the normal sintered Mn-Zn ferrites.
Volume 6 Issue 2 May 1984 pp 273-281 Superconductivity
An explanation has been offered for the mechanism of cooper pairing in the
Volume 6 Issue 6 December 1984 pp 1053-1057
The wavevector and temperature dependence of the spinwave linewidth in yttrium iron garnets has been studied for polycrystalline samples of average grain diameter 12·8
Volume 6 Issue 6 December 1984 pp 1063-1067
Volume 6 Issue 6 December 1984 pp 1069-1074
The exchange constants observed in the rare earth iron garnets, obtained from fitting magnetization and paramagnetic susceptibility as a function of temperature have been analysed in terms of Anderson’s theory of superexchange. The transfer integrals and covalency parameters have been obtained for various rare earth ions overlapping with oxygen.
Volume 7 Issue 3-4 October 1985 pp 237-251
An attempt has been made to review the ferromagnetic resonance and relaxation data on rare earth iron garnets and in the light of it, to analyze the data on Sm and Eu thin films and Gd and Dy bulk polycrystalline samples obtained in our laboratory. A phenomenological approach adopted to explain the temperature and composition dependence of the line width and
Volume 14 Issue 3 June 1991 pp 803-806 International Conference On Superconductivity—II
The field dependence and near zero magnetic field microwave absorption as a function of rf power in YBa2Cu3O7−
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