Abstract
Effect of Si substitution at Al site of Co2MnSi1-xAlx Heusler alloy for composition x = 0.25 on its structural and magnetic properties, prepared by the arc melting method, was studied. The alloy was characterized by X-ray diffraction (XRD), X-ray photo electron spectroscopy (XPS), energy dispersive X-ray analysis (EDAX) and magnetic measurements. Our findings revealed the soft ferromagnetic nature of alloy, crystallizes in the L21 structure of lattice parameter a = 5.671 Å. However, the presence of some antisite disorder (B2/A2) destroyed the half metallicity of alloy as computed by full-potential linearized augmented plane wave (FLAPW) method of density functional theory (DFT), indicates the traditional ferromagnetic behavior of Co2MnAl.25Si.75 alloy. Theoretical magnetic moment of Co2MnAl.25Si.75 alloy was found 4.29μB/formula unit (f.u.) in contrast to experimentally obtained moment 3.91μB/f.u., with good agreements with literature.
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