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Characterization of the Demagnetization Field in Iron-Nickel Nanopowder and Spark Plasma Sintered Samples

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Author Affiliations

  • 1Marthandam College of Engineering and Technology College Road, Kuttakuzhi, Veeyannoor Post, (Near Marthandam) Kanyakumari District- 629 177, Tamil Nadu, India
  • 2Madras Institute of Technology, Chromepet, Chennai 600044, Tamil Nadu, India
  • 3St. Joseph’s College of Engineering, Old Mahabalipuram Road, Chennai-600119, Tamil Nadu, India
  • 4St. Joseph’s College of Engineering, Old Mahabalipuram Road, Chennai-600119, Tamil Nadu, India
  • 5Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis (UniMAP), 02600 Arau, Perlis, Malaysia and Institute of Nano Electronic Engineering, Universiti Malaysia Perlis (UniMAP), 01000 Kangar, Perlis, Malaysia

Res. J. Material Sci., Volume 13, Issue (1), Pages 10-15, August,16 (2025)

Abstract

This study investigates the impact of alloying elements; spark plasma sintering, grain size, and particle size on the coercive field (Hc) in iron-nickel alloys. The findings reveal that, generally, an increase in nickel content leads to a reduction in Hc after 2 hours of milling. However, in these two-hour milled samples, a notable increase in Hc is observed compared to the initial values of iron and nickel powders. This Hc increase may be attributed to the weakened particle-to-particle interaction between iron and nickel. Changes in Hc are closely linked to variations in grain and particle size. Hc values decrease as the grain size diminishes, ranging from 250 nm to 75 nm. Remarkably, a high Hc value of 103 Oe is observed in the 75 wt.% Ni-Fe alloy after 100 hours of milling, indicating the formation of single-domain grains. A decrease in Hc is noted until a critical particle size is reached; beyond this point, Hc values remain relatively constant until reaching a second critical dimension, after which Hc increases with decreasing particle size. Additionally, the study reveals that the Hc values in spark plasma sintered samples are consistently lower than those in the powder samples.

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