Magnetic study of the ordered and quenched equiatomic FePt alloy

Abstract

M(H, T)‐curves of ordered and quenched polycristalline specimens of the equiatomic FePt alloy were taken from room temperature up to 620°C. The Curie temperature (446°C) of ordered FePt was found to be nearly 30°C lower than the hitherto reported value. The temperature dependency of (M2)H = 0 and (H/M)M → 0 agrees qualitatively with the predictions of the simple molecular field theory. For the saturation magnetization of FePt at room temperature an approximate value of 4πMs = 13500 G was determined, which confirms the results of a recent investigation but is much greater than that reported in the remaining literature. Ordered and quenched specimens showed no difference concerning Ms. From the paramagnetic susceptibility which was measured for the first time on this alloy, an effective moment of 3.4 Bohr magnetons per alloy atom was determined.

First-principles study of electronic structure and magnetic properties of L10-ordered FeNi, FePd, and FePt alloys

“…Based on our results, the first-principles calculations for a complete lattice relaxation reveal that model 3 is the most stable configuration. This conclusion coincides with the experimental outcome from the literature [ 41 ]. Furthermore, the PBE approximation results are the closest to the cited experimental values.…”

First-principles study of magnetic properties ofL10-ordered MnPt and FePt alloys

“…Such results are in agreement with experimental observations. [8][9][10][11][16][17][18] The small ͑ϳ7 meV͒ energetic preference of FM over AFM in FePt at T = 0 is in 25, it is shown that the correct FM ground state of FePt is predicted only when the generalized gradient approximation is used due to the more accurate estimation of lattice constants. The obtained values of lattice parameters and magnetic moments of MnPt Model 1͑AFM͒ and FePt Model 3͑FM͒ are in good agreement with the corresponding experimental data [8][9][10][11][22][23][24] and previous first-principles calculations.…”

“…Experimentally, FePt is well known to be ferromagnetic at room temperature 16 with a very large anisotropy energy ͑1.2 meV/f.u. for bulk͒ perpendicular to the atomic planes of Fe and Pt.…”