اثر غلظت کبالت بر رفتار مغناطیسی لایه های نازک آلیاژ آهن-کبالت تولید شده به روش کند و پاش موربی

نوع مقاله : مقاله پژوهشی

نویسندگان

• خلیل الله قیصری ¹
• چونگ کیم انگ ²

¹ دانشیار مهندسی مواد، گروه مهندسی مواد دانشکده مهندسی دانشگاه شهید چمران اهواز

² استاد فیزیک مرکز مغناطیس و ابررسانایی دانشکده فیزیک دانشگاه ملی سنگاپور

چکیده

در این پژوهش، اثر غلظت کبالت بر رفتار مغناطیسی لایۀ نازک آلیاژ آهن-کبالت با ترکیب CoxFe1−x (x= 0–0.3) مورد ارزیابی ساختاری و مغناطیسی قرار گرفت. به این منظور، لایه‌نشانی در زاویۀ نهشت 42 درجه به کمک روش کند و پاش یونی انجام شد. ساختار بلوری لایه‌های نشانده شده به کمک روش پراش سنجی پرتو ایکس ارزیابی گردید. ویژگی‌های استاتیک و دینامیک مغناطیسی نیز به ترتیب از روی حلقۀ مغناطش و طیف نفوذپذیری مغناطیسی تعیین گردید. نتایج ارزیابی‌های فازی نشان داد که الگوهای پراش مشابهی در همه لایه‌ها شکل گرفته است که معرف ساختار کریستالی BCC با جهت‌گیری ترجیحی (110) است. با این وجود، پارامتر شبکه با افزایش غلظت کبالت روند کاهشی را دنبال کرده است. حلقۀ‌های M-H دو رفتار متفاوت در جهت آسان‌گرد و سخت‌گرد را نشان داد. بر مبنای آن، میدان ناهمسانگردی مغناطیسی از حدود Oe 60 در لایۀ آهنی به Oe 330 در لایۀ Fe0.7Co0.3 افزایش یافت که به افزایش بسامد تشدید فرومغناطیسی از GHz 44/2 در لایۀ آهنی به GHz 66/7 در آلیاژ Fe0.7Co0.3 انجامید. بسامد تشدید فرومغناطیسی لایۀ آلیاژی Fe0.7Co0.3 کاهش اندکی را از مقدار GHz 66/7 در دمای محیط به GHz 98/6 در دمای K 420 نشان داد که گواه پایداری حرارتی مطلوب آن است.

کلیدواژه‌ها

• کند و پاش موربی
• لایۀ نازک آهن-کبالت
• ناهمسانگردی مغناطیسی
• بسامد تشدید فرومغناطیس
• پایداری حرارتی

20.1001.1.22285946.1399.11.41.7.1

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عنوان مقاله [English]

The Effect of Co Concentration on the Magnetic Properties of Obliquely Sputtered Fe–Co Thin Films

نویسندگان [English]

• khalil gheisari ¹
• Chong Kim Ong ²

¹ Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

² Center for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore, Singapore

چکیده [English]

In the present work, the effect of cobalt concentration on the magnetic properties of the Fe-Co alloy thin film with the composition of CoxFe1−x (x= 0–0.3) was investigated in detail. The films deposited at the incident angle of 42° using sputtering technique. The crystalline structure of the deposited films was evaluated via the X-ray diffraction method. The static and dynamic magnetic characteristics were determined from magnetization loops and permeability spectra, respectively. With regard to the phase analysis results, similar diffraction patterns have been found representing the BCC phase with (110) preferred orientation. Nevertheless, the lattice parameter decreases with increasing Co content. M-H loops indicate different behaviour along with the easy and hard direction. Based on that, the magnetic anisotropy field rises from 60 Oe at Fe film to 333 Oe at Fe0.7Co0.3 film which in turn leads to an increase in the ferromagnetic resonance frequency from 2.44 GHz at Fe film to 7.66 GHz at Fe0.7Co0.3 film. In addition, the resonance frequency of Fe0.7Co0.3 film exhibits a slight decrease from 7.66 GHz at room temperature to 6.98 GHz at 420 K indicating good thermal stability of the obtained film.

کلیدواژه‌ها [English]

• Oblique sputtering technique
• Fe-Co thin film
• Magnetic anisotropy
• Ferromagnetic resonance frequency
• Thermal stability

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