Investigation of Static and Dynamic Magnetization in Ni2FeAl Full Heusler Alloy Nanomaterials

Full Heusler alloys (FHA) offer excellent possibilities due to their high Curie temperature, spin polarization, and predicted half metallicity. Among various FHA, \({\text{Ni}}_{2} {\text{FeAl}}\) is the least studied alloy that can offer vast possibilities in exploring spin-based devices. By keeping this aspect in mind, \({\text{ Ni}}_{2} {\text{FeAl}}\) nanoparticles have been prepared by the cost-effective ball milling process. As-prepared dried samples were vacuum annealed at 900 °C in the presence of the mixture of H2 and N2 gas to avoid oxidation for different time durations. XRD pattern revealed the B2 type atomic ordering with a crystallite size of approximately \(21\) nm. Morphological properties were investigated using SEM which revealed the formation of uniform nanoparticle flakes. Nearly perfect stoichiometry was obtained in EDS elemental mapping. The ferromagnetic properties were investigated by static magnetic measurements conducted by vibrating sample magnetometry. The dynamic magnetic response was measured from Vector Network Analyzer ferromagnetic resonance (VNA-FMR) technique in a broad range of microwave frequencies (5–20 GHz). A broad FMR linewidth was obtained from the FMR experiment due to the presence of magnetic inhomogeneities in the bulk sample. The Gilbert damping parameter which describes the magnetization relaxation was obtained from the fitting of FMR data with the Landau-Lifshitz-Gilbert equation. We obtained the lowest value of the Gilbert damping for the sample annealed at 900 °C temperature for 4 h. These investigations can open a new pathway in designing and fabricating \({\text{Ni}}_{2} {\text{FeAl}}\) based ultra-fast, energy efficient spintronics devices.