Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-12-13
J. Appl. Phys. 104(1), 013923 (2008)
Physics
Condensed Matter
Other Condensed Matter
17 pages, 6 figures included
Scientific paper
10.1063/1.2952029
The magnetization ground states (MGSs) for a nanosized Co hollow sphere, with the outer radius, R < 50 nm, have been studied numerically by micromagnetic simulation using object oriented micromagnetic framework (OOMMF). In addition to the originally known single domain and vortex-curling states, a three dimensional "onion" state with a corresponding analytical expression is proposed and confirmed as one of the ground states. Two phase diagrams, one for a single crystalline and the other for a polycrystalline nanosphere, are obtained for the three MGSs. The result reveals that the magnetic anisotropy has a significant effect on the phase line in the diagrams. The finite temperature effect and the blocking properties of the nanosphere for the magnetization reversal are discussed.
Chen* Chinping.
Kong Desheng
Wang Siming
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