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The Core–Shell Separation of Ferromagnetic Nanoparticles with Strong Surface Anisotropy

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A modified Monte Carlo Metropolis method is performed to simulate the low-temperature magnetization behavior of the ferromagnetic nanoparticles with different sizes and surface anisotropies, based on three-dimensional classical Heisenberg model. It is found that an "insulating" layer appears to cut off the interaction between the surface and the core as the surface anisotropy is strong enough. The results also indicate that the magnetizing state of nanoparticles may change from a "collinear" structure into a "throttled," then into a "hedgehog-like," and finally into a "separation" structure with the increase of surface anisotropy. However, the "hedgehog-like" structure does not appear in the bigger size nanoparticles. The energy competition between the surface and the core in the ferromagnetic nanoparticles may be the reason for producing these phenomena.
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Keywords: CORE-SHELL SEPARATION; MAGNETIC NANOPARTICLE; MONTE CARLO METHOD; SURFACE ANISOTROPY

Document Type: Research Article

Publication date: 2009-10-01

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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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