کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1803938 1024637 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large vertical loop shifts in mechanically synthesized (Mn,Fe)2O3−t nanograins
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Large vertical loop shifts in mechanically synthesized (Mn,Fe)2O3−t nanograins
چکیده انگلیسی

Magnetic properties of zero field cooled (ZFC) and field cooled (FC) sample of (Mn,Fe)2O3−t nanograins have been investigated by magnetometry (up to 70 kOe) and Mössbauer spectroscopy (up to 60 kOe) in the temperature interval 4.2–300 K. Large horizontal (up to 0.8 kOe) and vertical (up to 80%) shifts of the magnetization hysteresis loops are observed in the FC regime. The obtained results are discussed in terms of exchange interaction between an antiferromagnetic core and a spin-glass-like state of the nanograins boundaries. It is shown that hysteresis loop shifts (horizontal and vertical) depend on the field cooling magnitude, an effect that can be understood by the change of the boundary magnetic structure induced by the external magnetic field. The vertical magnetization shift is described by a phenomenological model, which takes into account the magnetic interaction between the spin-glass like boundary spins and the applied field.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 314, Issue 1, July 2007, Pages 21–29
نویسندگان
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