کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333236 979070 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exchange interaction at the interface of Fe–NiOnanocomposites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Exchange interaction at the interface of Fe–NiOnanocomposites
چکیده انگلیسی

Fe–NiO nanocomposites with Fe to NiO ratio 20:80, 30:70 and 50:50 were prepared by a chemical route. X-ray diffraction and TEM measurements showed the presence of α-Fe and NiO phases in the prepared nanocomposites having an average crystallite size 17 nm. HRTEM image showed a structurally disordered phase at the Fe–NiO interface. Mössbauer spectra of the nanocomposites consist of a doublet along with a sextet corresponding to relaxed and blocked α-Fe phases, respectively. The dc magnetization measurements in field-cooled condition show a shift of hysteresis loop and an enhancement of coercive field at low temperature confirming the presence of exchange bias at Fe–NiO interfaces. The irreversibility observed in the FC and ZFC magnetization measurements also points to exchange bias effect.

Fe–NiO nanocomposites exhibited some structural disordered region at the interface as revealed by HRTEM. A prominent shift in the hysteresis loops in field cooled condition confirmed the presence of exchange bias at Fe–NiO interfaces. The irreversibility observed in M–T measurements also points to exchange bias effect.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 183, Issue 12, December 2010, Pages 2903–2909
نویسندگان
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