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In this study, nanocrystalline Ni 100-x Cu x  alloy films have been synthesised using DC magnetron co-sputtering under argon gas atmosphere to analyse their superparamagnetic behaviour. The nanocrystalline nature and the grain size of the alloy films have been measured using grazing incidence x-ray diffraction (GIXRD) and a transmission electron microscopy (TEM). The M-H curves obtained using superconducting quantum interference device provides evidence for superparamagnetic behaviour of the nanocrystalline Ni 100-x Cu x  alloy films. For the Ni 89 Cu 11  alloy films, the highest value (456 emu/cm 3 ) of saturation magnetisation has been measured. Zero field cooling (ZFC) and field cooling (FC) data obtained from superconducting quantum interference device (SQUID) showed the dependence of blocking temperature, T B  on Cu concentration of the investigated NiCu alloy. The blocking temperature is observed to decrease from 44 K to 33 K with increase in Cu concentration from 11 to 28 wt%.

Studies on superparamagnetic behaviour of Ni100-xCux alloy films deposited by DC magnetron sputtering