کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1521486 1511809 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic properties of interacting CoPt nanoparticles synthesized through polyol process
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Magnetic properties of interacting CoPt nanoparticles synthesized through polyol process
چکیده انگلیسی


• A simplified one-step one-pot polyol process to synthesis CoPt nanoparticles.
• Coercivity upto 7 kOe obtained on annealing at a relatively lower temperature of 600 °C.
• Curie temperature determined by thermo-magnetic analysis.
• Inter-particle interactions studied by δM analysis.

Co40Pt60 nanoparticles with an average particle size of 3.9 nm were prepared by polyol pathway without incorporating any capping agents or surfactants. The as-prepared nanoparticles were superparamagnetic having disordered A1-face centered cubic structure, which transforms to face centered tetragonal (L10) phase on heat treatment, without the requirement of a reducing gas. The Curie temperature of the Co40Pt60 nanoparticles was determined to be 482 °C from the thermomagnetic analysis. Coercivity upto 7 kOe was obtained on annealing at a relatively lower temperature of 600 °C. Anomalous variation in coercivity has been observed with annealing. Annealing temperature dependent two phase behavior was studied by δM measurements. The CoPt samples exhibited dipolar coupling on annealing up to 700 °C and strong exchange coupling was evident with further increase in annealing temperature.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 154, 15 March 2015, Pages 53–59
نویسندگان
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