کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153599 | 1524768 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of microstructure and magnetotransport properties of CrO2 prepared under HTHP
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The microstructure of the CrO2 particles prepared by high temperature and high pressure (HTHP) method was studied by HRTEM. It is found that the CrO2 particles synthesized at 500 and 550â¯Â°C are covered by Cr2O3 surface layers of about 6â¯nm thick. However, the CrO2 particles synthesized at 400 and 450â¯Â°C do not have Cr2O3 surface layers. The saturation magnetization of the CrO2 particles synthesized at different temperatures is all very close to the theoretical value. The magnetoresistance (MR) of the CrO2 particles synthesized at 500 and 550â¯Â°C is much larger than that of the CrO2 particles synthesized at 400 and 450â¯Â°C, which should be due to the enhancement of tunneling magnetoresistance by insulating Cr2O3 surface layers. The tunneling MR of the CrO2 particles can be fitted well by expression of C1(M/Ms)2â¯+â¯C2(M/Ms)4â¯+â¯C3(M/Ms)6. The proportion of the higher-order terms of (M/Ms)2 in the expression is tightly related to the existence of the Cr2O3 surface layer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 453, 1 May 2018, Pages 193-197
Journal: Journal of Magnetism and Magnetic Materials - Volume 453, 1 May 2018, Pages 193-197
نویسندگان
Y.B. Fan, R.K. Zheng, G.H. Wen,