کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9837351 | 1525274 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Large negative magnetoresistance in capsulated Co-Cu powder prepared by mechanical alloying
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Large negative magnetoresistance (MR) in mechanically alloyed, Cobalt-copper (Co-Cu) powder was observed at room temperature. Cu-Co powder (atomic ratio 30:70) milled for 30, 60 and 120Â h was packed in plastic capsules with the bulk densities of 2.68-3.96Â g/cm3. At room temperature, the alloyed Co-Cu capsules showed up to 70% decrease in electrical resistance when they were subjected to 11Â kOe applied magnetic field. It was proposed that the movement of loosely packed Co-rich cluster under the magnetic field, was the origin of this MR. The movement provided the more efficient electron pathways resulting in resistance decrease. The variation of the MR ratio was closely related to the milling time and the packed bulk density. With the same milling time, the optimum packed bulk density led to the highest MR ratio and the effect was suppressed at higher densities such as in pressed pellets. By virtue of fracturing and cold welding, the milling changed the cluster size distribution and intercluster distance. The structural, magnetic and thermal properties were also studied in order to understand the effect of the milling time on the alloyed powder.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 369, Issues 1â4, 1 December 2005, Pages 160-167
Journal: Physica B: Condensed Matter - Volume 369, Issues 1â4, 1 December 2005, Pages 160-167
نویسندگان
W. Rattanasakulthong, C. Sirisathitkul,