نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، مهندسی مواد، دانشگاه صنعتی همدان، همدان، ایران

2 استادیار، فیزیک، دانشگاه کردستان، سنندج، ایران

3 کارشناس ارشد، فیزیک، دانشگاه کردستان، سنندج، ایران

چکیده

آرایه های نانوسیمی Fe100−x Mn x (0 ≤ x ≤ 87) با استفاده از الکتروانباشت همزمان Fe و Mn در حفرات قالب اکسید آلومینیوم آندی (AAO) ساخته شده در آزمایشگاه سنتز شدند. تاثیر ترکیب درصد فلزات انباشت شده، دمای تابکاری و فرکانس الکتروانباشت بر ساختار بلوری و خواص مغناطیسی نانوسیم‌های سنتز شده مورد بررسی قرار گرفت. تغییرات مغناطش اشباع، وادارندگی (Hc) و نسبت مربعی (Mr/Ms) و تغییر ساختار بلوری با تغییر پارامترهای فوق مطالعه گردید. نتایج تصاویر SEM وطیف XRD ساختار bbc نانوسیم‌ها را مشخص نموده و نشان می‌دهد که فاز بلوری با تغییر دمای تابکاری تغییر می‌نماید. نانوسیم‌های تشکیل شده دارای ناهمسانگردی مغناطیسی تک محوره با جهت مغناطیسی آسان در امتداد محور نانوسیم می‌باشند که ناشی از ناهمسانگردی شکلی بزرگ است. همچنین، وادارندگی نانوسیم‌های Fe100−x Mn x با افزایش دمای تابکاری برای همه ترکیبات افزایش می‌یابد. از سوی دیگر، نانوسیم‌های الکتروانباشت شده در فرکانس های مختلف رفتار مغناطیسی متفاوتی را نشان می‌دهند زیرا با افزایش فرکانس الکتروانباشت سرعت احیا یونهای فلزی در قالب کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Preparation of Fe-Mn nanowire alloys and the study of the effect of manganese content, annealing and electrodeposition frequency on their magnetic properties

نویسندگان [English]

  • Mojgan Najafi 1
  • Zahra Alemipour 2
  • fatemeh Rajabi 3

1 Department of Materials Engineering, Hamedan University of Technology, Hamedan, Iran

2 Dapartment of Physics, Faculty of Science, Kurdistan University, Sanandaj, Iran

3 Dapartment of Physics, Faculty of Science, Kurdistan University, Sanandaj, Iran

چکیده [English]

Ordered Fe100−x Mn x (0 ≤ x ≤ 87) nanowire arrays have been prepared by co-electrodeposition of Fe and Mn into pores of homemade anodized aluminum oxide (AAO). The influence of composition, annealing temperature, and frequency on structure and magnetic properties of Fe/Mn nanowires was studied. The changes in the saturation magnetization, coercivity (Hc), remanent squareness (Mr/Ms), and crystal structure of nanowires with changing of the above parameters were also investigated. The results of XRD and SEM suggest that the nanowires have a bcc structure and that their phases change with the annealing temperature. The nanowires have uniaxial magnetic anisotropy with easy magnetization direction along the nanowire axis due to the large shape anisotropy. Also, the coercivity of the Fe100−xMn x nanowires was increased with increasing annealing temperature for all the compositions. On the other hand, the nanowire arrays electrodeposited at different electrodeposition frequencies show remarkably different magnetic behaviors, due to increasing of the electrodeposition frequency, the rate of ions for reduction was decreased.

کلیدواژه‌ها [English]

  • Nanowire
  • Electrodeposition
  • Coercivity
  • Fe-Mn alloy

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