کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1803088 1024609 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic response of magnetic nanoparticles arranged in a tubular shape
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Dynamic response of magnetic nanoparticles arranged in a tubular shape
چکیده انگلیسی
We have developed a model that describes the ferromagnetic resonance spectra recently observed in nanotubes formed by assembled La0.67Sr0.33MnO3 manganite nanoparticles. The resonance line shape in these tubes resembles that of a system of randomly oriented flat particles instead of what is usually seen in elongated samples. In order to explain the experimental data we have assumed that each individual grain (or small group of grains) has an easy plane effective anisotropy which could be partially aligned in a cylindrical symmetry. The magnetization of each grain is also distributed around a mean value, and hence the magnitude of the anisotropy varies from grain to grain. Within this framework we have been able to fit reasonably well the resonance field and the overall line shape of nanotubes that were deposited on a glass substrate and were aligned in a magnetic field. From the simulations we have deduced an average effective magnetization M=180emu/cm3 with a distribution width of 140emu/cm3. This value of magnetization is smaller than that of bulk LaSr manganites at room temperature, probably due to the granular nature of the tubes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issue 14, July 2008, Pages e218-e221
نویسندگان
, , , , ,