بررسي تأثير دما و pH بر خواص مغناطيسي نانوسيم هاي FexCo1-x سنتز شده در قالب آلوميناي آندي متخلخل، به روش رويه پاسخ

Investigation of the influence of temperature and pH on the magnetic properties of FexCol-x nanowires embedded in porous anodic alumina template using response surface methodology

Ferromagnetic nanowires are of particular interest due to the significance in the potential applications in the high density magnetic storage technology. Anodic alumina has a highly oriented porous structure with very uniform and nearly parallel pores thet can be organized in an almost precise hexagonal structure. These merits make it become an ideal template for preparing metal or semiconductor nanowires. Recently, attention has been shifted towards preparing alloy arrays such as Fe-Co nanowires, because It is easy to change the coercivity and squareness ^ of recording media by adjusting the synthesis conditions of these nanowires. In this research, anodic alumina was fabricated by two step anodization technique. Nanohole array with 30 nm di¬ameter and 80 nm interpore distances were formed during anodization procedure. The ac electrodeposition technique was employed to fabricate Fe-Co nanowires under different conditions. We have used the response surface methodology (RSM) for the experimental design and optimized conditions. The effect of annealing temperature, Fe concentration, pH ^ and temperature of deposition solution on magnetic properties and alloying composition of the nanowires was inves- ^ tigated. The optimum conditions for preparing Fe-Co nanowires with larger coercivity were predicted to be: annealing .as ^ temperature, 575 °C; Fe concentration, 50.3%; pH, 6; temperature of deposition solution, 39 °C. ^ Keywords: Porous alumina, FexCol-x nanowire, Response surface methodology, Hystersis loop, Coercivity