نویسندگان

1 دانشکده فیزیک، دانشگاه تبریز، تبریز

2 دانشکده فیزیک، دانشگاه صنعتی اصفهان، اصفهان

چکیده

نانومغناطیس شاخه‌ای از فناوری نانو است که به بررسی ویژگی‌های نانوذرات مغناطیسی می‌پردازد. ابرپارامغناطیس تک حوزه، ابر فرومغناطیس و شیشه ابراسپینی از حالات مختلف مغناطیسی‌اند که در مجموعه‌ای از نانوذرات مشاهده شده است. هر کدام از این حالات مغناطیسی دارای ویژگی‌های منحصر به فردی هستند و محدوده کاربرد نانوذرات را تعیین می‌کنند. یک نانوذره دارای پوسته‌ای متشکل از اسپین‌های بی نظم و هسته‌ای با اسپین‌های تقریبا منظم است. مطالعه سیستم نانوذرات نیاز به کاوش و مشخصه‌یابی ویژگی‌های متعددی از جمله انواع ناهمسانگردی‌ها، قدرت برهم‌کنش بین ذرات، زمان‌های واهلش، میدان وادارندگی، مغناطش باقی مانده، مغناطش اشباع و... دارد. محققان تلاش‌های فراوانی در جهت مشخصه‌یابی نانوذرات مغناطیسی می‌کنند که با گسترش دامنه کاربرد این مواد در صنعت، پزشکی و زندگی روزمره، این تحقیقات روز به روز رشد فزاینده‌ای می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Nanomagnetism

نویسندگان [English]

  • B Aslibeiki 1
  • P Kameli 2
  • H Salamati 2

چکیده [English]

Nanomagnetism is a branch of nanotechnology, which studies the magnetic properties of nanoparticles. Single-domain superparamagnetim, superferromagnetism and superspin glasses are different magnetic states which have been observed in a system of nanoparticles. Each of these magnetic states has unique features which determines the application range of magnetic nanoparticles assembly. Shell of nanoparticles is composed of canted spins while the core spins are almost regular. Study of nanoparticles system needs to explore and characterize several features, including different anisotropies, interactions between the particles, relaxation times, coercivity, remanent magnetization, saturation magnetization and etc. Researchers have made great efforts to characterize magnetic nanoparticles. Investigations in nanomagnetism field increases by developing the application range of nanoparticles in industry, medicine and daily life

کلیدواژه‌ها [English]

  • nanoparticles
  • superparamagnetism
  • AC susceptibility
  • interactions
  • Henkel plot

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