توسعه لایه‌های نازک پر انرژی بر پایه مغناطیس‌های نادر خاکی تبادلی ارتجاعی با ترکیب NdFeB/FeCo

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی مالک اشتر، شاهین شهر، اصفهان

چکیده

در این پژوهش نه لایه نازک NdFeB و FeCo با ضخامت 10-50 نانومتر بر زیرلایه 2 Si/SiOبه روش پراکنش امواج رادیویی مگنترونی تهیه شد. سیستم ایجاد شده در کوره عملیات حرارتی مادون قرمز در دمای 800 درجه‌سانتی‌گراد به مدت 5 ثانیه تحت عملیات بلوری شدن قرار گرفت. تحلیل فازی لایه­ها به‌وسیله پراش پرتو ایکس بررسی و وجود فازB14Fe2Nd و 35Co65Fe بدون هیچ نوع فاز ثانویه دیگری تایید شد. سطح مقطع لایه­ها به‌وسیله میکروسکوپ الکترونی روبشی مورد بررسی و مطالعه قرار گرفت. مورفولوژی سطح لایه­ها توسط میکروسکوپ نیروی اتمی بررسی شد. به کمک مغناطومتر ارتعاشی با میدان مغناطیسی اعمالی kOe24 خواص مغناطیسی لایه­ها شامل نیروی پسماندزدا، مغناطش اشباع، سطح حلقه پسماند، نسبت مربعی شدن و max(BH) مورد ارزیابی قرار گرفت. مشخص شد که تمام لایه­ها ناهمسان‌گردی مغناطیسی عمودی دارند و با افزایش ضخامت لایه FeCo، مغناطش اشباع و نیروی پسماندزدا و مغناطش پسماند افزایش می­یابد. نتایج نشان می‌دهد که با افزایش ضخامت لایه FeCo به 20 نانومتر، برهم­کنش تبادلی بین لایه­های سخت و نرم مغناطیسی افزایش می‌یابد و به همین دلیل حداکثر انرژی تولید شده توسط این ساختار ناهمگن افزایش می­یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Development of High Energy Thin Layers of Exchange Spring Magnets Originating from Rare Earth Magnets of NdFeB/FeCo

نویسندگان [English]

  • A. R. Khanjani
  • A. Ghasemi
Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Iran
چکیده [English]

In this study, nine Nd-Fe-B and FeCe thin films with 10-50 nanometers width were prepared by RF magnetron sputtering on the Si/SiO2 substrate. Then, the films were annealed at 800 oC for 5 sec in rapid thermal annealing furnace. X-ray diffractometry (XRD) was used to analyze the phase composition of layers and existance of Nd2F14 and Fe65Co35 phase was confirmed, without formation of any other secondary phase. The layers surfaces were investigated using Field Emission Scanning Electron Microscope (FESEM). The morphology of layers surfaces was investigated using Atomic Force Microscope (AFM). The magnetic properties of layers were evaluated by vibrating sample magnetometer with maximum applied field of 24kOe, in order to measure coercivity, saturation of magnetization, hysteresis area, rectangular ratio and (BH)max. It was found that all layers have vertical magnetic anisotropy. Increasing thickness of FeCo resulted in increasing saturation of magnetization,  coercivity and saturation magnetization. The results indicate that by an increase in thickness of FeCo up to 20nm, exchange interaction strength between hard and soft magnetic layers is enhanced and, consequently, maximum energy induced from this hetero-structure is increased.

کلیدواژه‌ها [English]

  • multilayer
  • hysteresis curve
  • Exchange interaction

مراجع

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مواد پیشرفته در مهندسی
دوره 35، شماره 2
شهریور 1395
صفحه 1-10

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