| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Abnormal Temperature Dependence of Coercivity in Cobalt Nanowires |
| FAN Xiu-Xiu1, HU Hai-Ning2, ZHOU Shi-Ming1,3, YANG Mao4, DU Jun4, SHI Zhong1,3** |
1Surface Physics State Laboratory and Department of Physics, Fudan University, Shanghai 200433
2School of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090
3Department of Physics, Tongji University, Shanghai 200092
4Department of Physics, Nanjing University, Nanjing 210093 |
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FAN Xiu-Xiu, HU Hai-Ning, ZHOU Shi-Ming et al 2012 Chin. Phys. Lett. 29 077802 |
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Abstract Co nanowire arrays have been fabricated into anodic aluminum oxide templates at 20°C by dc electrodeposition. It is shown that Co nanowires fabricated at lower and higher growth voltages have a hexagonal close packing (hcp) structure with preferred [100] orientation along the nanowire axis and a face-centered cubic (fcc) structure with preferred [220] orientation, respectively. With increasing growth voltage, the room-temperature coercivity along the nanowire axis is enhanced gradually. For fcc Co nanowires, the coercivity increases monotonically with increasing temperature while for hcp Co nanowires, a minimal coercivity is obtained along both parallel-to-axis and perpendicular-to-axis orientations with the temperature rising from 50 K to 390 K. The abnormal temperature dependence of the coercivity can be attributed to the competition between the shape anisotropy and magnetocrystalline anisotropy as a function of temperature.
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Received: 01 April 2012
Published: 29 July 2012
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