Effect of High Magnetic Field Annealing on Magnetic Properties of CoFe O Nanowire Arrays

Cobalt ferrite (CoFe 2 O 4 ) nanowire arrays with different diameters were prepared in porous anodic aluminum oxide (AAO) template by a sol-gel template method. A magnetic field annealing procedure was performed in the direction along wire axis (out of sample planes) at 600°C under 10-T applied magn...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2011-10, Vol.47 (10), p.2855-2858
Main Authors: Wu, Zhangben, Yu, Ronghai, Yang, Bai, Cai, Wupeng, Zou, Zhiyu, Tang, Ruihe, Jiang, He, Liu, Xiaofang, Yang, Mingjie, Liu, Wei
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Annealing
Cobalt ferrite
magnetic anisotropy
magnetic field annealing
Magnetic hysteresis
Magnetometers
nanowire array
Perpendicular magnetic anisotropy
Saturation magnetization
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Summary:Cobalt ferrite (CoFe 2 O 4 ) nanowire arrays with different diameters were prepared in porous anodic aluminum oxide (AAO) template by a sol-gel template method. A magnetic field annealing procedure was performed in the direction along wire axis (out of sample planes) at 600°C under 10-T applied magnetic field to orient the spinel CoFe 2 O 4 crystalline. The morphology was studied by scanning electron and transmission electron microscope. X-ray diffraction (XRD) patterns show that samples performed by the magnetic field annealing procedure have a 〈110〉 texture along the nanowire axis, while those annealed without applied magnetic field show a nonoriented polycrystalline phase of spinel type structure. Vibration sample magnetometer (VSM) test shows the difference between CoFe 2 O 4 nanowire arrays samples annealed with or without applied magnetic field. This difference shows the magneto-crystalline anisotropy with the easy magnetization direction along the nanowire axis, and is caused by the resultant effect of the easy magnetization direction distribution of the crystalline.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2011.2148105