Synthesis and magnetic characterization of Co-NiO-Ni core-shell nanotube arrays

J. Y. Chen, N. Ahmad, D. W. Shi, W. P. Zhou, X. F. Han

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Well-aligned Ni and Co-NiO-Ni core-shell nanotube arrays with an average outer diameter of about 200 nm have been synthesized in a porous anodic aluminum oxide (AAO) template by the direct electro-deposition method. The result shows that the nanotubes were polycrystalline phase. Angular dependent coercivity H c indicates that the magnetization reversal mechanisms are mainly dominated by the curling mode for Ni nanotubes, while a transition from curling to transverse is observed in Co-NiO-Ni core-shell nanotubes at a large angle. A sharp increase in saturated magnetization (M s) of Ni and Co-NiO-Ni core-shell nanotubes at 5 K was observed, due to dominance of the surface effect. Besides, the existed superparamagnetic nanoparticles also resulted in the increase of M s for both cases. These structures have potential applications in the novel spintronics device, ultrasmall magnetic media, and other nanodevices.

Original languageEnglish (US)
Article number073912
JournalJournal of Applied Physics
Volume110
Issue number7
DOIs
StatePublished - Oct 1 2011

Fingerprint Dive into the research topics of 'Synthesis and magnetic characterization of Co-NiO-Ni core-shell nanotube arrays'. Together they form a unique fingerprint.

Cite this