کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1800752 | 1024545 | 2012 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Ferromagnetic resonance in Ni–Zn ferrite nanoparticles in different aggregation states Ferromagnetic resonance in Ni–Zn ferrite nanoparticles in different aggregation states](/preview/png/1800752.png)
Ferrite nanoparticles of composition Zn0.5Ni0.5Fe2O4 were synthesized by forced hydrolysis in polyol from the corresponding zinc, nickel and iron acetates. By varying the preparation conditions, different aggregation states were obtained, ranging from isolated nanoparticles with average diameter of 5 nm, to clusters of some 20 nm, formed as well by nanoparticles with average diameter in the 5 nm range, as confirmed by X-ray diffraction and high resolution transmission electron microscopy. Ferromagnetic resonance measurements exhibited a ferrimagnetic behavior for both aggregation states at 77 K; at 300 K, however, isolated nanoparticles showed a superparamagnetic behavior while clustered ones remained ferrimagnetic with a broad linewidth. These results are interpreted on the basis of interactions between nanoparticles.
Journal: Journal of Magnetism and Magnetic Materials - Volume 324, Issue 21, October 2012, Pages 3398–3401