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The structure of L10-FePt nanoparticles in the presence of Ag | ||
| Journal of Interfaces, Thin Films, and Low dimensional systems | ||
| دوره 3، شماره 2، شهریور 2020، صفحه 297-304 اصل مقاله (474.27 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22051/jitl.2020.32375.1042 | ||
| نویسندگان | ||
| Mohammadreza Salahpour؛ Seyed Ali Sebt* ؛ Ana Khajehnezhad | ||
| Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| چکیده | ||
| Temperature above 600°C during the fabrication process is required to form the L10 compound ordering phase in FePt nanoparticles. The L10-FePt nanoparticles are ferromagnetic with high magnetic anisotropy. Practically, another ordering that is required is the orientation of their crystal c axis perpendicular to the plane of the nanolayer. The effects of the presence of Ag in reducing the transition temperature and making FePt nanocrystals in the L10-FePt phase aligned, in this work, have been studied and determined. The results of XRD analysis indicate that in fabrication using the co-sputtering method, firstly, the presence of Ag before annealing gives rise to the decline of the c parameter of the crystal lattice. This result of XRD analysis has been compared with the result of the RKKY exchange interaction model as an experimental confirmation of this model. Secondly, during annealing, with the formation of FePt-Ag nanostructure, the easy axis of FePt nanoparticles in the L10-FePt phase appears parallel to each other. These results, which are the consequence of the presence of Ag, are obtained by studying FE-SEM images, XRD patterns, and magnetic characterization. | ||
| کلیدواژه‌ها | ||
| L10-FePt nanoparticles؛ FePt-Ag؛ orientation؛ co-sputtering؛ RKKY interaction | ||
| عنوان مقاله [English] | ||
| ساختار نانو ذرات L10-FePt در حضور نقره | ||
| نویسندگان [English] | ||
| محمدرضا صلاح پور؛ سید علی سبط؛ آنا خواجه نژاد | ||
| گروه فیزیک، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران. | ||
| چکیده [English] | ||
| برای تشکیل فاز منظم ترکیبی L10 در نانو ذرات FePt، دمای بالای 600 درجه سانتیگراد در طی فرآیند ساخت لازم است. نانو ذرات L10-FePt، فرومغناطیس با ناهمسانگردی مغناطیسی بالا هستند. به لحاظ عملی، نظم دیگری که مورد نیاز است، جهت گیری محور c بلوری آن ها به طور عمود بر صفحه نانو لایه است. در این کار، اثرات حضور Ag در کاهش دمای گذار و هم راستا کردن نانو بلورهای FePt در فاز L10-FePt، مطالعه و تعیین شده است. نتایج آنالیز XRD نشان می دهند که در ساخت با استفاده از روش کندوپاش همزمان، اولا، حضور Ag قبل از گرمادهی موجب کاهش پارامتر c شبکه بلوری می شود. این نتیجه آنالیز XRD، با نتیجه مدل برهم کنش تبادلی RKKY به عنوان یک تایید تجربی این مدل مقایسه شده است. ثانیا، در طی گرمادهی، با تشکیل نانو ساختار FePt-Ag، محور آسان نانو ذرات FePt در فاز L10-FePt، موازی با یکدیگر ظاهر می شوند. این نتایج که پیامد حضور Ag می باشند، از مطالعه تصاویر FE-SEM، طرح های XRD و مشخصه مغناطیسی به دست می آیند. | ||
| کلیدواژه‌ها [English] | ||
| نانو ذرات L10-FePt, جهت گیری, کندوپاش همزمان, برهم کنش RKKY | ||
| مراجع | ||
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