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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 shellthickness of about 60 nm. The shell is polycrystalline with an averagecrystallite size of 20 to 35 nm. The blocking temperature determined by thezero-field-cooling MZFC(T) measurement at H = 90 Oe is about 325 K. Thecorresponding effective anisotropy is determined as, Keff = 4.6*10^4 J/m^3. Inaddition, the blocking temperature and the effective anisotropy determined bythe analysis on HC(T) are 395 K and 5.7*10^4 J/m^3, respectively. Theexperimentally determined anisotropy is smaller by one order of magnitude thanthe magnetocrystalline anisotropy of the bulk hcp Co, which is about 3 to5*10^5 J/m^3. A further analysis on HC(T) shows that the magnetization reversalfollows 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. Thepossible reason for the much reduced magnetic anisotropy is discussed briefly.

Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres