Coherent Rotation and Effective Anisotropy

It is shown in this paper that the concept of effective anisotropy is of sound physical sense only when the nucleation mode is coherent rotation. Comparison of coherent and incoherent nucleation fields demonstrates that the coherent rotation can take place at very small defect size. The critical siz...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2007-06, Vol.43 (6), p.2908-2910
Main Authors: Zhao, G.P., Wang, X.L., Feng, Y.P., Huang, C.W.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Anisotropy
Coercive force
Coherence
Coherent rotation
Cross-disciplinary physics: materials science
rheology
Defects
effective anisotropy
Exact sciences and technology
Exchange
Magnetic anisotropy
Magnetic materials
Magnetism
Materials science
Micromagnetics
Microstructure
Nucleation
nucleation modes
Other topics in materials science
Permanent magnets
Perpendicular magnetic anisotropy
Physics
Saturation magnetization
Superconducting magnets
Superconducting materials
Three dimensional
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Summary:It is shown in this paper that the concept of effective anisotropy is of sound physical sense only when the nucleation mode is coherent rotation. Comparison of coherent and incoherent nucleation fields demonstrates that the coherent rotation can take place at very small defect size. The critical size below which the coherent rotation is favorable is roughly the domain wall-width with 3-D soft defects and is smaller for oriented exchange-coupled permanent magnets with planar soft defects. The effect of misaligned grains has also been considered and it is illustrated that the effective anisotropy has to be used very carefully: it can only be used in limited cases and its expression varies as the microstructures change
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2007.893629