کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11263105 | 1781703 | 2019 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Exchange bias and magnetoresistance effects in La2-xSrxCoMnO6 (0.05 ⤠x ⤠0.5)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Double perovskites with Sr2+-doping at the A-site in La2-xSrxCoMnO6 (0.05â¯â¤â¯xâ¯â¤â¯0.5) are synthesized by the standard solid-state reaction method. X-ray diffraction indicates that the initial monoclinic crystal structure transforms to rhombohedra with the increasing Sr-doping from xâ¯=â¯0.05 to 0.5. The Sr-doped samples (0.1â¯â¤â¯xâ¯â¤â¯0.3) possess mixed crystallographic phases with monoclinic and rhombohedra structure. The appropriate amount of Sr-doping (xâ¯=â¯0.3) can effectively increase exchange bias effect to reach a maximum value of 6.5â¯kOe (at 5â¯K) under the 10â¯kOe cooled magnetic field. The exchange coupling of uncompensated magnetic moment at the interface between ferromagnetic and antiferromagnetic phases is responsible for the variation trend of exchange bias effect. A large enhanced negative magnetoresistance effect (approximately 67.1%) of the xâ¯=â¯0.3 sample is observed at 85â¯K and 70â¯kOe. The reduction of the density of spin polarization states at Fermi level caused by disorder of Co/Mn ions is the reason for the decreasing magnetoresistance effect in the multiple Sr-doping (xâ¯>â¯0.3).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 646-650
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 646-650
نویسندگان
Lei Xing, Qiuhang Li, Mingxiang Xu,