A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates.Petal-likeα-Fe_(2)O_(3)nanoslices and honeycomb-likeα-Fe_(2)O_(3)par...A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates.Petal-likeα-Fe_(2)O_(3)nanoslices and honeycomb-likeα-Fe_(2)O_(3)particles of micrometer sizes are obtained after annealing at 500℃but with different rates of heating to the final annealing temperature.Structures and morphologies of the samples are studied by means of x-ray diffraction,scanningelectron microscopy and atomic force microscopy.These structures are believed to be formed during the period of increasing temperature to the final annealing temperature.Superconducting-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.展开更多
CoxZn1-x nanorod arrays were fabricated by electrodeposition in porous anodic aluminum oxide templates at different electric potentials. X-ray diffraction and transmission electron microscopy indicate that highly-orde...CoxZn1-x nanorod arrays were fabricated by electrodeposition in porous anodic aluminum oxide templates at different electric potentials. X-ray diffraction and transmission electron microscopy indicate that highly-ordered and uniform nanorods have been fabricated. The amounts of Co and Zn contents are investigated using energy dispersive spectroscopy, which demonstrates that the atom ratio of the alloy nanorods changes with the deposition potential. In addition, magnetic measurements show that the magnetic isotropy Co-rich CoZn nanorods will change to magnetic anisotropy nanorods with the easy axis parallel to the rod long axis with decreasing Co content.展开更多
基金Supported by the Natural Science Foundation of Hebei Province Grant No A2009000254the Ph.D.Fund of Hebei Normal University Grant Nos L2010B06 and L2009Y03.
文摘A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates.Petal-likeα-Fe_(2)O_(3)nanoslices and honeycomb-likeα-Fe_(2)O_(3)particles of micrometer sizes are obtained after annealing at 500℃but with different rates of heating to the final annealing temperature.Structures and morphologies of the samples are studied by means of x-ray diffraction,scanningelectron microscopy and atomic force microscopy.These structures are believed to be formed during the period of increasing temperature to the final annealing temperature.Superconducting-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.
基金Supported by the Natural Science Foundation of Hebei Province under Grant No A2009000254, and the PhD Fund of Hebei Normal University under Grant No L2006B10.
文摘CoxZn1-x nanorod arrays were fabricated by electrodeposition in porous anodic aluminum oxide templates at different electric potentials. X-ray diffraction and transmission electron microscopy indicate that highly-ordered and uniform nanorods have been fabricated. The amounts of Co and Zn contents are investigated using energy dispersive spectroscopy, which demonstrates that the atom ratio of the alloy nanorods changes with the deposition potential. In addition, magnetic measurements show that the magnetic isotropy Co-rich CoZn nanorods will change to magnetic anisotropy nanorods with the easy axis parallel to the rod long axis with decreasing Co content.
