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Xu Q.,Hebei University of Technology | Xu Q.,Key Laboratory of Advanced Films of Hebei Province | Ye W.-J.,Hebei University of Technology | Feng S.-Z.,Hebei Normal University | And 3 more authors.
Dyes and Pigments | Year: 2014

A simple method of fabricating Co-containing anodic aluminum oxide films for multifunctional anti-counterfeit technology is reported. The films display highly saturated colors after being synthesized by an ac electrodeposition method. Tunable color in the films is obtained by adjusting anodization time, and can be adjusted across the entire visible range. Magnetic measurements indicate that such colored composite films show excellent magnetic properties. The resulted short (310 nm in length) and wide (50 nm in diameter) Co nanowires present only hexagonal close-packed phase, with the coercivity and squareness ratio as high as 1.2 × 105 A/m and 0.803, respectively. The magnetization reversal mechanism is in good agreement with coherent rotation model. The color and magnetic properties remain the same over a wide temperature range. The Co-containing anodic aluminum oxide films with structural color and perpendicular magnetic recording properties have friability-resistant feature and could be used in many areas including decoration, display and multifunctional anti-counterfeiting applications. © 2014 Elsevier Ltd. All rights reserved.


Gu J.,Hebei Normal University | Gu J.,Key Laboratory of Advanced Films of Hebei Province | Yang S.,Hebei Normal University | Yang W.,Hebei Normal University | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2014

Multiferroic composite thin films with composition (1-x)BiFeO 3-xNiFe2O4 (x=0.00, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared by chemical solution deposition(CSD). The results show that with increasing x, the average size of the crystal grains of BiFeO3 diminishes gradually, and the leakage current density in composite thin films decreases while the remnant polarizations increases. The calculated results for the ferromagnetic contribution of the NiFe2O4 indicated that BiFeO3 also contributed magnetic moment to the composite films. On comparing the grain sizes and magnetic measurement results of the composite thin films with x=0.20 and 0.25, we found that the decreasing crystal grain size of the BiFeO3 was responsible for ferromagnetism and that the enhanced magnetoelectric coupling effect in composite thin films was also an important factor. © 2013 Elsevier B.V.


Zhang X.,Hebei Normal University | Zhang X.,Key Laboratory of Advanced Films of Hebei Province | Zhang H.,Hebei Normal University | Zhang H.,Hebei University of Science and Technology | And 9 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

FeNi alloy nanowires and nanotubes have been fabricated in the pores of the anodized aluminum oxide (AAO) templates by direct current electrodeposition with different potentials. The crystal structure and micrograph of FeNi alloy nanowires and nanotubes were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, and the content was confirmed by energy dispersive spectrometry. The results indicate that there is a critical potential in the formation of nanowires and nanotubes. FeNi alloy nanowires and nanotubes both present the (111) preferred orientation, and the content of Fe is reduced with the decrease of electrodeposition potentials. The magnetic behaviors of FeNi alloy nanowires and nanotubes with different ratios are investigated. The coercivity of FeNi alloy nanowires and nanotubes exhibits disparate behavior, which may attribute to their grain size and distinctive structure. CrownCopyright © 2012 Published by Elsevier B.V. All rights reserved.


Zhang H.-M.,Hebei Normal University | Zhang H.-M.,Hebei University of Science and Technology | Zhang H.-M.,Key Laboratory of Advanced Films of Hebei Province | Zhang X.-L.,Hebei Normal University | And 7 more authors.
Journal of the Electrochemical Society | Year: 2013

A possible growth mechanism for template-based electrodeposition metal nanotubes was presented.We proposed that the formation of nanotube was a result of kinetics controlling the deposition process, and was related to the crystal structure. According to the mechanism, various nanotubes, such as Zn, Co, Cu, Ni, ZnNi, and CoNi, were fabricated with aluminum oxide templates using a DC electrodeposition method. The deposit morphology dependence of potential was discussed. We further elaborated the feasibility of the mechanism from crystal growth perspective as well as kinetics and thermodynamics perspectives. This work will benefit further understanding the growth process of electrodeposited nanotubes, and provide important experimental data for crystal growth theory. © 2012 The Electrochemical Society.


Zhang H.-M.,Hebei Normal University | Zhang H.-M.,Hebei University of Science and Technology | Zhang H.-M.,Key Laboratory of Advanced Films of Hebei Province | Zhang X.-L.,Hebei Normal University | And 7 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

CoNi nanotubes were prepared in pores of anodic aluminum oxide templates via a dc electrodeposition method. The dependence of product morphology on the applied potential was studied over the range-1.0 to -2.5 V. The results showed that a critical potential related to the electrodeposition parameters exists, below which the deposited product was almost entirely in the form of nanotubes, whereas above which, nanowires are formed. Magnetic measurements showed hysteresis loops of the nanotubes are discontinuous. Theoretical analysis suggested the existence of some peculiar magnetization configuration such as vertical Bloch line which was responsible for the discontinuity of the hysteresis loops. © 2013 Elsevier BY. All rights reserved.

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