Firman Hanif Romadhon 

Department of Physics, Faculty Mathematics and Natural Science, University of Jember, Jember, Indonesia

Lutfi Rohman

Department of Physics, Faculty Mathematics and Natural Science, University of Jember, Jember, Indonesia

Imam Rofi’i

Department of Physics, Faculty Mathematics and Natural Science, University of Jember, Jember, Indonesia

DOI: https://doi.org/10.19184/cerimre.v8i1.53697

ABSTRACT 

This study aims to evaluate the effect of composition on the Curie temperature (Tc) value and examine the impact of temperature on the hysteresis curve and magnetic properties of NiFe ferromagnetic materials. The methods used include molecular dynamics to calculate the exchange interaction value (Jij) and the Monte Carlo method to determine the Tc value. Simulations were carried out on various compositions of NiFe material to obtain a complete picture of its magnetic properties. The simulation results show that the Ni10Fe90 composition with a cube structure has the highest Tc value, 660 K, while in the sphere structure, Tc reaches 620 K. The magnetization value of the material decreases with increasing temperature and approaches zero when approaching the Curie temperature. Meanwhile, the susceptibility value has a low value at low temperatures, increases to reach the maximum value at Curie temperature, and decreases thereafter. The decrease in susceptibility value after reaching Curie temperature indicates a change in the phase of the material from ferromagnetic to paramagnetic. These findings are significant as they provide a deeper understanding of the behavior of NiFe ferromagnetic materials at different temperatures. Other observations were made to analyze the hysteresis curve. The results obtained from the hysteresis curve show a magnetic saturation value of 1 and an easy axis located on the z-axis, with a coercivity field of 0.05 Oe. In conclusion, NiFe material with Ni10Fe90 composition shows optimal magnetic performance at high temperatures, making it a promising candidate for applications in certain thermal environments. This study provides important insights into the relationship between the composition, structure, and magnetic properties of NiFe materials, as well as the implications for the development of more efficient ferromagnetic materials.

Keywords: NiFe, Curie Temperature, VAMPIRE, Exchange Interaction, Ferromagnetic.