Physics – Condensed Matter – Materials Science
Scientific paper
2007-05-20
Phys. Rev. B 75, 214418 (2007)
Physics
Condensed Matter
Materials Science
10 pages, 5 figures, submitted to PRB
Scientific paper
10.1103/PhysRevB.75.214418
Magnetic properties with chains of hcp Co hollow spheres have been studied. The diameter of the spheres ranges from 500 to 800 nm, with a typical shell thickness of about 60 nm. The shell is polycrystalline with an average crystallite size of 20 to 35 nm. The blocking temperature determined by the zero-field-cooling MZFC(T) measurement at H = 90 Oe is about 325 K. The corresponding effective anisotropy is determined as, Keff = 4.6*10^4 J/m^3. In addition, the blocking temperature and the effective anisotropy determined by the analysis on HC(T) are 395 K and 5.7*10^4 J/m^3, respectively. The experimentally determined anisotropy is smaller by one order of magnitude than the magnetocrystalline anisotropy of the bulk hcp Co, which is about 3 to 5*10^5 J/m^3. A further analysis on HC(T) shows that the magnetization reversal follows a nucleation rotational mode with an effective switching volume, V* = 2.3*10^3 nm^3. The corresponding effective diameter is calculated as 16.4 nm. It is slightly larger than the coherence length of Co, about 15 nm. The possible reason for the much reduced magnetic anisotropy is discussed briefly.
Chen* Chinping.
Guo Lin
He Lin
Liang Fang
No associations
LandOfFree
Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-586139