Template-based synthesis and magnetic properties of Ni nanotube arrays with different diameters |
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Authors: | Xue Wei Wang Zhi Hao Yuan Bing Cheng Fang |
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Affiliation: | 1. School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, People''s Republic of China;2. Tianjin Key Lab for Photoelectric Materials and Devices, Tianjin 300384, People''s Republic of China;3. Key Laboratory of Display Materials & Photoelectric Devices (Tianjin University of Technology), Ministry of Education, Tianjin 300384, People''s Republic of China |
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Abstract: | Ni nanotube arrays with different diameters were fabricated in the pores of the porous anodic alumina membranes by direct current electrodeposition. The crystal structure and micrograph of Ni nanotube arrays were characterized by X-ray diffraction, transmission electron microscopy, and field-emission scanning electron microscopy. The results indicate that Ni nanotubes have no preferred orientation and are polycrystalline structure. The magnetic behaviors of Ni nanotube arrays with different diameters are investigated, and the coercivity of Ni nanotubes depends strongly on their diameters. The size-dependent behavior of the coercivity is qualitatively explained in terms of localized magnetization reversal. |
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