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Finite Element Micromagnetism Simulations on the Magnetization Reversal Behaviors of Cobalt Nanotubes

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In this paper, we have used the finite element micromagnetism theory to simulate the magnetization (M) reversal behaviors of cobalt nanotubes with different lengths (L = 400, 600, 800 and 1000 nm). The inner radius and outer radius of nanotubes are 50 nm and 100 nm respectively. The simulation results show that all the nanotubes exhibit significantly anisotropic behaviors: the easy magnetization axis is along the longitudinal direction. The coercivity values are found dependent on the dimensions of Co nanotubes. For the nanotube with a length of 400 nm, M reversal processes along the Z axis starts from the inner wall and propagates from the inside toward the outside. However, for other nanotubes, M reversal processes start from both ends of nanotubes. When the magnetic field (H) is applied along the hard axis, magnetic moments gradually change their directions into the opposite directions. The variations of the total Gibbs free energy have been calculated to support the observed differences in reversal processes.


Document Type: Research Article


Publication date: 2010-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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