کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1801419 | 1524897 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Magnetic properties of Ni nanoparticles on microporous silica spheres Magnetic properties of Ni nanoparticles on microporous silica spheres](/preview/png/1801419.png)
Ni nanoparticles (~32 nm particle diameter) have been synthesized on the walls of microporous (~1 nm pore diameter) silica spheres (~2.6 μm sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper.
Journal: Journal of Magnetism and Magnetic Materials - Volume 322, Issues 9–12, May–June 2010, Pages 1269–1274