Ferroelectric Properties of CuFe2O4, BaFe2O4, Ba0.2La0.8Fe2O4 Nanoparticles

control of the optical properties of nanoparticles by laser fields

در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...

Magnetic and ferroelectric properties of multiferroic Bi2NiMnO6 nanoparticles

Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles

Hollow BiFeO3nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly e...

Magnetic and structural properties of pulsed laser deposited CuFe2O4 films

Highly crystal textured copper ferrite films have been grown on s100d MgO substrates using pulsed laser deposition. Deposition temperatures were varied from 600–900 °C, with deposition oxygen pressure varied from 1 mTorr to 120 mTorr. Saturation magnetization was measured to increase monotonically with substrate temperature approaching the bulk value of 1700 G near 900 °C. Magnetization was als...

Percolation Magnetism in Ferroelectric Nanoparticles

Nanoparticles of potassium tantalate (KTaO3) and potassium niobate (KNbO3) were synthesized by oxidation of metallic tantalum in molten potassium nitrate with the addition of potassium hydroxide. Magnetization curves obtained on these ferroelectric nanoparticles exhibit a weak ferromagnetism, while these compounds are nonmagnetic in a bulk. The experimental data are used as a start point for th...