کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10269397 | 459855 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface treatment of ferromagnetic nanoparticle-assembly by UV irradiation with ozone
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Fe-Pt nanoparticles of 3.5Â nm in average particle diameter are obtained with the simultaneous chemical reduction of platinum acetylacetonate and the thermal decomposition of iron pentacarbonyl. Because the as-synthesized particles are superparamagnetic at room temperature, they must be transformed to L10 ordered phase by annealing at temperatures above 773Â K to apply to high-density magnetic recording media. However, the annealing at such high temperatures induces the coalescence and inter-particle sintering. In the present paper, to solve the problem caused by the annealing, we use ultraviolet-ozone treatment to modify particle surface. Even after annealing at 773Â K, the crystalline size is kept at 4.4Â nm. Furthermore, coercivity is higher than that without the ultraviolet-ozone treatment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 5, 10 November 2005, Pages 860-863
Journal: Electrochimica Acta - Volume 51, Issue 5, 10 November 2005, Pages 860-863
نویسندگان
Mu-Pei Chen, Kazuya Kuroishi, Yoshitaka Kitamoto,