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Effect of annealing temperature on magnetic properties of nano crystalline Ni-Fe-W-S thin films in Diammonium Citrate bath

R. KANNAN1,* , S. GANESAN2, T. M. SELVAKUMARI3

Affiliation

  1. Department of Physics, KSR College of Engineering, Tiruchengode-637215, Tamil Nadu, India
  2. Department of Physics, Government College of Technology, Coimbatore-641001, Tamil Nadu, Ind
  3. Department of Physics, Angel College of Engineering & Technology, Tirupur-641665, Tamil Nadu, India

Abstract

The nano crystalline Ni-Fe-W-S thin films were deposited by electro deposition method in diamminoum citrate bath at 40°C. Annealing of the deposited thin film was performed at 200° C temperature for 1 hour. The effect of annealing on the magnetic and structural properties of the product film was investigated by using Vibrating Sample Magnetometer (VSM) and X-ray diffractometer (XRD). Elemental composition and surface morphology of the films were studied using Energy Dispersive X-ray spectroscopy (EDAX) and Scanning Electron Microscope (SEM) respectively. Mechanical properties such as Hardness and adhesion of the films were also studied. Due to the improvement of soft magnetic properties in the 200°C annealed film, the saturation magnetization is enhanced by 0.10935 emu/ cm2 (coercivity decreased to 32 Oe) compared with the case of as deposited film at bath temperature of 40° C. The magnetic flux density (Bs) of the annealed film was enhanced by 4.5703 Tesla. Hardness of the annealed film increased from 147 VHN to 155 VHN. Enhanced nano crystalline grains with size of 30.6 nm were observed in the annealed films. This shows that the soft magnetic properties of Ni-Fe-W-S thin films are greatly enhanced by annealing at 200° C which can be used in MEMS applications..

Keywords

Annealing, Nano crystalline, Enhanced magnetic properties and hardness.

Submitted at: May 19, 2012
Accepted at: Sept. 20, 2012

Citation

R. KANNAN, S. GANESAN, T. M. SELVAKUMARI, Effect of annealing temperature on magnetic properties of nano crystalline Ni-Fe-W-S thin films in Diammonium Citrate bath, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 9-10, pp. 774-780 (2012)