Fabrication and magnetic properties of amorphous Co0.71Pt0.29 nanowire arrays |
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| Authors: | Hua Li Yikun Su Hulin Li |
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| Institution: | a College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
b State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, P.R. China |
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| Abstract: | Highly ordered Co0.71Pt0.29 alloy nanowire arrays have been fabricated successfully by direct current electro-deposition into the pores of a porous anodic aluminum oxide (AAO) template. SEM and TEM images reveal that the nanowires of array are uniform, well isolated, and parallel to one another. The aspect ratio of nanowires is over 200. XRD and EDS pattern indicates that amorphous Co0.71Pt0.29 structure was formed during electro-deposition. In amorphous sample, magnetocrystal anisotropy is very small, therefore, shape anisotropy plays a dominant role which leads to strong perpendicular anisotropy. High coercivity (Hc=1.7 kOe) and squareness (Mr/Ms) around 0.7 were obtained in the samples when the field was applied parallel to the axis of the nanowires. However, when it changed to polycrystalline structure after annealing, due to the competition of magnetocrystal anisotropy and shape anisotropy, the sample did not display perpendicular anisotropy. |
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| Keywords: | 75 30 Gw 75 50 Ss 75 60 Ej 82 45 Qr |
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