Uttar Pradesh, India
Uttar Pradesh, India

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Saxena N.K.,Agra College Agra | Kumar N.,Solid State Physics Laboratory | Pourush P.K.S.,Agra College Agra
Indian Journal of Physics | Year: 2010

Due to the generation of magnetostatic and spin waves, switching phenomena of ferrite substrate with a normal magnetic biasing field is presented. Generally below the X-band of microwave range, the Pozar's quasi TEM waves (extraordinary waves) were studied, but for the study of X-band there should be an inclusion of spin wave exchange term (ωr) in the magnetostatic wave analysis which depends upon the static internal field (Hex). This term is included in analysis because the wavelength of microwave approach is the inter-atomic distance of ferrite material. In this work we synthesize LiTi ferrite through Solid State Reaction Technique (SSRT) and obtained electric and magnetic properties for the analysis. Absorbing and transmission power coefficients have been calculated to obtain the power loss and transmitted power through the substrate, respectively. The absorbing power coefficient verifies the switching behavior of substrate for certain range of applied external magnetic field (Ho) which depends on the resonance line width parameter (ΔH) of ferrite material. © 2010 IACS.

Mane R.G.,Bhabha Atomic Research Center | Surendran P.,Bhabha Atomic Research Center | Kumar S.,Agra College Agra | Nair J.P.,Bhabha Atomic Research Center | And 7 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2016

Recently, we have performed systematic Secondary Ion Mass Spectrometry (SIMS) measurements at our ion source test set up and have demonstrated that gas phase 32SFn - (n = 1-6) anions for all size 'n' can be readily generated from a variety of surfaces undergoing Cs+ ion sputtering in the presence of high purity SF6 gas by employing the gas spray-cesium sputter technique. In our SIMS measurements, the isotopic yield ratio 34SFn -/32SFn - (n = 1-6) was found to be close to its natural abundance but not for all size 'n'. In order to gain further insight into the constituents of these molecular anions, ultra sensitive Accelerator Mass Spectrometry (AMS) measurements were conducted with the most abundant 32SFn - (n = 1-6) anions, at BARC-TIFR 14 UD Pelletron accelerator. The results from these measurements are discussed in this paper. © 2015 Elsevier B.V.All rights reserved.

Saxena N.K.,Agra College Agra | Kumar N.,Solid State Physics Laboratory | Pourush P.K.S.,Agra College Agra | Khah S.K.,Jaypee University of Information Technology
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2010

Ferrite is one of the most versatile magnetic materials which is frequently used for the high frequency microwave systems. The substituted lithium ferrites have been found most suitable for microwave device applications because of their inherent properties such as high Curie temperatures, high dielectric constant, high saturation magnetization & low dielectric losses. A composition of titanium substituted Li-ferrite with saturation magnetization 2200 Gauss has been synthesized and investigated which can be used for antenna applications in microwave frequency range. The material was prepared by solid state reaction technique (SSRT) and later studied for its electrical, magnetic & structural behaviors. It is observed that LiTiZn ferrite shows different magnetic behavior during DC biasing for microwave frequency antenna applications. The paper describes a precise description of LiTiZn-ferrite preparation, its characteristic plots with a detailed study of nonreciprocal behavior of LiTiZn ferrite slab or substrate under magnetic biasing.

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