Magnetic behavior of ordered DO3-type Fe3Al Heusler alloy

Fe3Al alloy is synthesized in a vacuum arc-melting furnace under an argon atmosphere. The prepared ingot is annealed in a vacuum furnace at 800 degrees C for 1 hr, further at 500 degrees C for 48 hrs to facilitate the re-crystallization. The alloys are crystallized in a cubic DO3 structure. The magnetic properties are derived from M-H, and M-T measurements and the thermal properties like transition temperature (T-c), heat flow, and heat capacity (C-p) are measured from DSC. We have observed the magnetic transition at a temperature of 925 degrees K with an applied magnetic field of 5000 Oe. The saturation magnetization (M-r) is found to be 188 emu/g, and remanence magnetization (M-s) of 0.78 emu/g. From M-T and DSC measurements it appears that the samples have ferromagnetic ordering with second-order phase transition. The critical exponent is derived by applying mean-field, 3D-Heisenberg, 3D-Ising, and tricritical models. (C) 2022 Elsevier Ltd. All rights reserved.