Size-Dependent Nonmagnetic Surface Layer of Ferromagnetic Nanoparticles

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Abstract:

Based on the size-dependent melting temperature, we have deduced the analytic models for size-dependent Curie temperature Tc and saturation magnetization at room temperature Ms for ferromagnetic nanocrystals. The Tc(D) and Ms(D) functions decrease with decreasing size D. Agreements between model predictions and the corresponding experimental results enable us to determine the size-dependent thickness of nonmagnetic surface layer (D) and (D) in describing Tc(D) and Ms(D), respectively. It is found that the surface layer should be an intrinsic property of ferromagnetic crystals since the nonmagnetic surface layer exists in the whole size range rather than vanishes as D approaches infinite.

Keywords: DEAD LAYER; FERROMAGNETIC NANOCRYSTALS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2927

Publication date: November 1, 2010

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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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