کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153828 | 1524769 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A phenomenological approach to study the effect of uniaxial anisotropy on the magnetization of ferromagnetic nanoparticles
ترجمه فارسی عنوان
یک رویکرد پدیده شناختی برای بررسی اثر آنیزوتروپیک دو طرفه بر مغناطش نانوذرات فرومغناطیس
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
We study the effect of the uniaxial anisotropy in a system of ideal, noninteracting ferromagnetic nanoparticles by means of a thermodynamical model. We show that the effect of the anisotropy can be easily assimilated in a temperature shift Taâ, in analogy to what was proposed by Allia et al. (2001) in the case of interacting nanomagnets. The phenomenological anisotropic Taâ parameter can be negative, indicating an antiferromagnetic-like behavior, or positive, indicating a ferromagnetic-like character as seen in the inverse susceptibility behavior as a function of temperature. The study is done considering an easy axis distribution to take into account the anisotropy axis dispersion in real samples (texture). In the case of a volumetric uniform distribution of anisotropy axes, the net effect makes Taâ to vanish, and the magnetic susceptibility behaves like a conventional superparamagnetic system, whereas in the others a finite value is obtained for Taâ. When magnetic moment distribution is considered, the effect is to enhance the Taâ parameter, when the dispersion of the magnetic moments becomes wider.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 452, 15 April 2018, Pages 230-242
Journal: Journal of Magnetism and Magnetic Materials - Volume 452, 15 April 2018, Pages 230-242
نویسندگان
N. Sánchez-MarÃn, A. Cuchillo, M. Knobel, P. Vargas,