کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8157431 1524861 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-temperature relaxation process and memory effect in a nonstoichiometric magnetite of Fe3−δO4 with δ=0.03
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Low-temperature relaxation process and memory effect in a nonstoichiometric magnetite of Fe3−δO4 with δ=0.03
چکیده انگلیسی
The low-temperature relaxation process has been investigated in a nonstoichiometric magnetite Fe3−δO4 with δ=0.03. Far below the Verwey transition at TV=90 K, the measurements of AC susceptibility χac display a frequency-dependent anomaly of the shoulder in χ' accompanied with the peak in χ″ and their weak thermal hysteresis. These low-temperature anomalies are related to a thermal relaxation process owing to the domain-wall mobility and extra electron exchange inside the walls. Moreover, the low-temperature relaxation process is revealed to exhibit strong memory effect via field-cooling magnetization measurements. Interesting discrete sudden jumps are observed during the logarithmic decay of magnetization in zero field with aging time, indicating the spontaneous magnetization reversals via adjustment of domain configuration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 360, June 2014, Pages 178-182
نویسندگان
, , , , , ,