Electrodeposition of equiatomic FeNi and FeCo nanowires: Structural and magnetic properties

• Published in: Journal of magnetism and magnetic materials 2020-01, Vol.493, p.165746, Article 165746
• Main Authors: Mansouri, Naima, Benbrahim-Cherief, Nassima, Chainet, Eric, Charlot, Fréderic, Encinas, Thierry, Boudinar, Salem, Benfedda, Baya, Hamadou, Lamia, Kadri, Aziz
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum oxide; Anisotropy; Annealing; Anodic aluminum oxide; Anomalous codeposition; Chemical Sciences; Cobalt; Codeposition; Coercivity; Composition; Crystal structure; Crystallinity; Equiatomic FeCo/FeNi alloys; Ferrous alloys; Field emission microscopy; Hysteresis loops; Inorganic chemistry; Magnetic properties; Magnetism; Magnetometers; Morphology; Nanowires; Pore size; Porosity; Scanning electron microscopy; Structural and microstructural analysis; Thin films; X-ray diffraction
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.165746

•Comparison of the anomalous codeposition phenomenon in FeNi and FeCo nanowires.•Homogeneous equiatomic FeCo nanowires were obtained along the nanowires length.•Out of plane magnetization direction was obtained for the FeNi and the FeCo nanowires.•The coercivity (Hc) doesn’t change enough with the annealing treatment for the FeNi nanowires.•An important increase of Hc is observed for FeCo nanowires with the annealing. In the present work, equiatomic FeNi and FeCo magnetic nanowires (NWs) have been electrodeposited in Anodic Aluminum Oxide (AAO) membranes with 70 nm pore size. The role of the electroactive species Ni2+ and Co2+ on the anomalous codeposition behavior in thin films and nanowires has been discussed and compared. Field Emission Gun-Scanning Electron Microscope (FEG-SEM), X-ray diffraction (XRD) and Vibrating Sample Magnetometer (VSM) were used to evaluate the morphology, composition, crystalline structure and magnetic properties of the materials. SEM-FEG analysis showed very homogeneous NWs lengths for both FeNi and FeCo NWs, Energy dispersive X-ray spectroscopy (EDS) analysis revealed a stable composition along the FeCo NWs and a change in composition along the FeNi NWs. The XRD patterns indicate the predominance of the bcc structure for both alloys. Except for additional peaks of fcc phase found on FeNi alloy, the same crystalline bcc structure is observed after annealing treatment of 300 °C during 20 h. TEM analysis confirmed the ordered character of the bcc FeCo alloy. The hysteresis loops show an easy magnetization direction parallel to the wires due to the predominance of the shape anisotropy. The coercive field (Hc) of FeNi NWs increases with the length of the wires while that of FeCo NWs decreases. The annealing treatment doesn’t affect the magnetic properties of FeNi NWs, whereas a remarkable increase in the coercivity of the FeCo NWs is observed.