Induced ordering in electrodeposited nanocrystalline Ni–Mn alloys

Abstract

The Ni 3 Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by electrodeposition was investigated by using x-ray diffraction, differential scanning calorimetry ͑DSC͒, thermogravimetric analyzer, Mössbauer spectroscopy, and transmission electron microscopy. The investigations reveal the existence of composition-induced Ni 3 Mn-type ordering in the as-deposited film of 76.2 at. % Ni. The atomic disorder is characterized by an exothermic effect in DSC. An analysis of the broad exothermic transition reveals the stages of phase transformation leading to ordering. The Curie temperatures of the alloys were determined from thermomagnetic measurements, the maximum value obtained for the ordered sample. Mössbauer spectroscopy at room temperature reveals ordered ͑ferromagnetic͒ and disordered ͑paramagnetic͒ phases in the as-deposited films. Superlattice reflections observed in selected area electron diffraction pattern for the 76.2 at. % Ni film alone further support the observation of composition-specific atomic ordering.

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Influence of bath temperature and deposition time on hardness and magnetisation of electrodeposited Nickel Manganese Tungsten thin films

“…Ni and its high strength alloys employ more useful materials for MEMS application due to their vast usage in the form of mechanical and magnetic elements such as motors, precision gears, latches, flexure spring arms, high density recording media, a magnetic shield, high performance transformer cores and magnetic actuators [1]. Electrodeposition is simple, rapid and inexpensive method for preparing nano structured metal and alloy as thin films [2][3][4]. Electrodeposited Ni-Mn thin film posses high strength, good ductility and low stress used in microsystems and in probe spring applications [5,6].…”