• N LAKSHMI

      Articles written in Bulletin of Materials Science

    • Magnetic behaviour of ${}^{57}$Fe/Co/Al multilayers deposited on a glass substrate

      V JAIN A R CHANDRA N LAKSHMI V R REDDY S JANI

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      Multilayers of ${}^{57}$Fe/Co/Al 20 and 40 trilayers (TLs) prepared on a glass substrate using ion beam sputtering deposition techniques have been studied. Magnetization curves obtained at different angles show the anisotropic nature of both the samples. Both samples show strong in-plane uniaxial anisotropy. Negative $\delta m$ values suggest that dipolar type interactions between grains contribute to the in-plane uniaxial anisotropy. Angular dependence of coercivity indicates that the magnetization reversal mechanism is different for both samples. The variation in coercivity with azimuthal angle is wellreproduced in the 20 TL sample using the modified Kondorsky model and by the Stoner–Wohlfarth model in the 40 TL sample.

    • A comparative study of structural, electronic and optical properties of cubic CsPbI$_3$: bulk and surface

      KUMAVAT SONI N LAKSHMI VISHAL JAIN AARTI RANI CHANDRA RAKESH JAIN

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      In order to acquire a reasonable description of the structural, electronic and optical properties of the perovskite compound CsPbI$_3$, first principle calculations have been computed by density functional theory implemented in the WIEN2k code. The calculations are presented within PBE-sol for exchange correlation functions coupled with modified-Becke–Johnson (mBJ) exchange potential. The (001) surfaces of CsPbI$_3$ for varying thicknesses have been constructed using the Structeditor program implemented in the WIEN2k code. The lattice constant, band gap and DOS have been computed. The CsPbI$_3$ bulk and surface exhibit a direct band gap located at the $R$ symmetry point of the Brillouin zone. The band gap approaches experimental values when the exchange correlation function is coupled with mBJ. The optical propertiesof CsPbI$_3$ were computed in terms of dielectric properties, refractive index, extinction coefficient, absorption coefficient, conductivity, reflectivity and energy loss. The direct band gap nature and high-absorption power of the surfaces of CsPbI$_3$ in the (001) direction in the infrared, visible and ultraviolet energy range make it suitable for use in optical and optoelectronic devices.

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