Articles written in Bulletin of Materials Science
Volume 2 Issue 2 May 1980 pp 83-89 Articles
The rapid development of magnetic bubble technology has required growth to exacting specifications of a large number of magnetic films of garnets and some amorphous binary and ternary alloys of rare-earth and transition metals. The characterisation of these films is an essential part in the search for newer materials which hold out promise for better device performance and cost viability. Many methods of films characterisation have been reported from time to time. By and large, these methods can be divided into two groups: one, bulk measurements made on the film and two, measurements made on the domains. We have attempted to collate and briefly introduce various techniques to characterise magnetic bubble materials in this review.
Volume 3 Issue 3 November 1981 pp 325-331
Electron transport properties of a few hot-pressed garnets of the series Y3−xGdxFe5O12 (where
Volume 4 Issue 1 March 1982 pp 7-9
The relative properties of high spin and low spin Co8+ in HoCoO3, ErCoO3 and LuCoO3 are about 1 : 1 above a characteristic temperature. YbCoO3 seems to show a similar behaviour with no evidence of electron transfer between the high spin and low spin states.
Volume 6 Issue 1 February 1984 pp 17-20
The Mössbauer spectroscopy of polycrystalline Y3−
Volume 6 Issue 1 February 1984 pp 53-57
Thin films of yttrium iron garnet (
Volume 9 Issue 5 December 1987 pp 349-353
Noncrystalline garnet films of nominal composition Y3Fe5O12 and Y2GdFe5O12 were synthesized by RF sputtering. The AC and DC resistivity data have been discussed in line with the model of Mott and Davis where conduction occurs through excitation of carriers into localized states at the band edges and hopping at energies close to the band tails.
Volume 15 Issue 5 August 1992 pp 431-439 Seminar On Ceramies And Glasses For Electronic Applications
Magnetic oxides, a major constituent of magnetic ceramic materials, are most extensively used in a variety of applications as soft, moderate and hard ferrites. I review here its applications with special emphasis on some recent developments in magnetic recording materials.
Volume 18 Issue 2 April 1995 pp 155-160
The quaternary Al75Mn10Fe5Si10 alloy was synthesized by induction melting, melt spinning and subsequent annealing. The melt spun sample shows the multiply twinned nodular-type microstructure. These plates surround an icosahedral seed of the nodule. Annealing induces relaxation/transformation of the seeds due to diffusion process. We studied the electrical properties of all the three states (as-cast, quenched and annealed) of Al75Mn10Fe5Si10 alloy. The results are discussed in the framework of Ziman-Faber theory.
Volume 21 Issue 2 April 1998 pp 133-137
The possibility of synthesizing a Ca-ferrite based biocompatible glass ceramic has been explored in the following two glass compositions: (i) 28Na2O-8CaO-3P2O5-llFe2O3-50SiO2, and (ii) 25Na2O-8CaO-3P2O5-20Fe2O3-41SiO2-3B2O3 (in weight ratio). The effect of simulated body fluid on the different glasses and glass ceramics was also investigated. While there is no direct evidence for apatite formation, the weight losses recorded and formation of a Si-rich layer at the surface appears to be an indication of onset of apatite formation. The rate of apatite formation is presumably retarded due to the presence of Al3+ (picked up from AL2O3 crucible). Ferromagnetic resonance experiments at 9.03 GHz demonstrate that these glass ceramics can possibly be used for microwave hyperthermia.
Volume 21 Issue 5 October 1998 pp 393-398 Materials Preparation
Properties of substituted La-manganites are known to be very sensitive to La site substitution. The critical parameters appear to be (a) the charge and concentration of the substituted ions, which determine the Mn3+/Mn4+ ratio, (b) the average ionic radius at the
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