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We report the structural, transport, electronic, and magnetic properties ofCo$_2$FeGa Heusler alloy nanoparticles. The Rietveld refinements of x-raydiffraction (XRD) data with the space group Fm$\bar {3}$m clearly demonstratesthat the nanoparticles are of single phase. The particle size (D) decreaseswith increasing the SiO$_2$ concentration. The Bragg peak positions and theinter-planer spacing extracted from high-resolution transmission electronmicroscopy image and selected area electron diffraction are in well agreementwith data obtained from XRD. The coercivity initially increases from 127~Oe to208~Oe between D = 8.5~nm and 12.5~nm, following the D$^{-3/2}$ dependence andthen decreases with further increasing D up to 21.5~nm with a D$^{-1}$dependence, indicating the transition from single domain to multidomain regime.The effective magnetic anisotropic constant behaves similarly as coercivity,which confirms this transition. A complex scattering mechanisms have beenfitted to explain the electronic transport properties of these nanoparticles.In addition we have studied core-level and valence band spectra usingphotoemission spectroscopy, which confirm the hybridization between $d$ statesof Co/Fe. Further nanoparticle samples synthesized by co-precipitation methodshow higher saturation magnetization. The presence of Raman active modes can beassociated with the high chemical ordering, which motivates for detailedtemperature dependent structural investigation using synchrotron radiation andneutron sources.

Investigation of the structural, electronic, transport and magnetic properties of Co$_2$FeGa Heusler alloy nanoparticles