Cylindrical granular nanowires of different FePd alloys: synthesis and characterization

JULIETA S. RIVA; PAULA G. BERCOFF; M.SOLEDAD APREA

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Congreso; 2020 Express Conference on the Physics of Materials and its application in Energy and Environment (e-CPM2020); 2020

(CINVESTAV - México) y (UCN - Chile)

Fe-Pd NWs were synthesized in commercial anodic alumina porous templates using potentiostatic electrodeposition. The potential for the electrodeposition was −1.5 V vs. Ag/AgCl, and the deposition time was 30 min. The electrolyte used was a mixture of Pd(II) and Fe(III) solutions, complexed with ammonium citrate and ammonium hydroxide to keep the pH = 9.00. The Pd(II) and Fe(III) solutions were mixed in different proportions before electrodeposition in order to obtain samples of different compositions.Two NWs arrays, of 10μm long and 200 nm diameter NWs were synthesized, of compositions Fe65Pd35 and Fe50Pd50. The NWs were characterized using scanning and transmission electron microscopy (SEM, TEM) and energy-dispersive X-ray spectroscopy (EDS). The characterization of the crystalline structure was performed by X-ray powder diffraction (XRD) at room temperature. In both samples, a cubic fcc disordered structure of Fe-Pd alloy was identified. The segregation of small amounts of Fe was also detected. The magnetic properties of the NWs arrays were assessed by measuring the ZFC-FC curves and hysteresis loops M(H) at different temperatures. It was possible to determine that the easy magnetization axis is along the NWs axis, indicating strong shape anisotropy in this direction.