Unusual ferromagnetic behaviour of embedded non-functionalized Au nanoparticles in Bi/Au bilayer films

摘要: There is a growing consensus through various experimental and theoretical studies that gold can exhibit magnetic properties at low dimensions in contrast to its well-known diamagnetic nature when bulk form. Although simulation show bare nanoclusters be intrinsically magnetic, reports prove this theory are scarcely available since most of the based on functionalized nanoparticles. In article, we report unusual ferromagnetic behaviour observed embedded non-functionalized Au nanoparticles using superconducting quantum interference device (SQUID) magnetometry. These obtained after irradiating thermally deposited Au/Bi double bilayer films 1.5 MeV ions different fluences from 5 × 1014 1 1016 per cm2. A detailed study cross-sectional high resolution transmission electron microscopy (X-HRTEM) results for irradiated sample confirms presence with an average size 2.61 nm. The attributed these were formed ion irradiation.