کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1804357 1024647 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exchange bias in Co nanoparticles embedded in an Mn matrix
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Exchange bias in Co nanoparticles embedded in an Mn matrix
چکیده انگلیسی

Magnetic properties of Co nanoparticles of 1.8 nm diameter embedded in Mn and Ag matrices have been studied as a function of the volume fraction (VFF). While the Co nanoparticles in the Ag matrix show superparamagnetic behavior with TB=9.5 K (1.5% VFF) and TB=18.5 K (8.9% VFF), the Co nanoparticles in the antiferromagnetic Mn matrix show a transition peak at ∼65 K in the ZFC/FC susceptibility measurements, and an increase of the coercive fields at low temperature with respect to the Ag matrix. Exchange bias due to the interface exchange coupling between Co particles and the antiferromagnetic Mn matrix has also been studied. The exchange bias field (Heb), observed for all Co/Mn samples below 40 K, decreases with decreasing volume fraction and with increasing temperature and depends on the field of cooling (Hfc). Exchange bias is accompanied by an increase of coercivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 316, Issue 2, September 2007, Pages 155–158
نویسندگان
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