بهبود ویژگی‌های مغناطیسی ترکیب هویسلر Co2FeSi با اصلاح نظم بلوری نمونه‌ها در فرایندهای مختلف ساخت

نویسندگان

دانشگاه یزد

چکیده

در این پژوهش، با هدف بهبود ویژگی­های مغناطیسی، ترکیب هویسلر Co2FeSi طی فرایندهای آزمایشگاهی مختلف ساخته شد. مقایسه ساختار بلوری نشان داد نمونه­های ساخته شده به‌روش آسیاکاری نسبت به نمونه­های ساخته شده از روش ذوب­قوسی از نظم بلوری بهتری برخوردارند. پخت نمونه حاصل از آسیاکاری باعث بهبود نظم بلوری و درنتیجه دستیابی به بیشترین مغناطش اشباع برابر با μB/F.u. 24/5 شد. تفاوت در مغناطش اشباع سایر نمونه­ها با توجه به مدل هسته- پوسته توضیح داده شد. بررسی رفتار وادارندگی با توجه به سازوکارهای فعال در این نمونه­ها نشان داد کوچک شدن اندازه ذرات مهم‌ترین نقش را در افزایش وادارندگی در نمونه­های آسیا شده دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Improving the Magnetic Properties Co2FeSi Heusler Compound by Modifying the Crystalline Order in Different Manufacturing Procedures

نویسندگان [English]

  • M. Hakimi
  • M. Safari
Research and Technology of Magnetism Lab. physics Department, Yazd University, Yazd, Iran.
چکیده [English]

In this study, the improvement of the magnetic properties of Co2FeSi Heusler compound was followed by the utilization of different experimental synthesizing procedures. Comparing the crystal structure showed that the milled samples had a higher crystalline order than the arc-melted ones. Annealing of the milled sample improved the crystalline order, resulting in the highest saturation magnetization (5/24 μB/F.u.). The difference in the saturation magnetization of the other samples was explained by the core-shell model. Comparison of the various coercivity mechanisms showed that the decrease in the size of crystallites played a key role in the higher value of the milled samples coercivity.

کلیدواژه‌ها [English]

  • Heusler alloys
  • Crystalline ordering
  • magnetization
  • Core-shell
  • Coercivity milling
  • Arc-melting
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