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Title: Evolution of domain walls and reversal mechanism in exchange-coupled nanolayers
Authors: Zhao, G.P.
Chen, L.
Huang, C.W.
Feng, Y.P. 
Keywords: Coercivity mechanism
Domain-wall evolution
Hysteresis loop
Issue Date: Aug-2009
Citation: Zhao, G.P., Chen, L., Huang, C.W., Feng, Y.P. (2009-08). Evolution of domain walls and reversal mechanism in exchange-coupled nanolayers. Journal of Magnetism and Magnetic Materials 321 (15) : 2322-2326. ScholarBank@NUS Repository.
Abstract: The demagnetization process for an exchange-coupled double-nanolayer system with perpendicular easy axes has been investigated within a micromagnetic model. The nucleation field, coercivity and angular distribution of the magnetization, have been obtained as functions of the thickness L of the misaligned layer, the layer with the easy axis perpendicular to the applied field. It is found that the coercivity is identical to the nucleation field only for very small L. For larger L (larger than a quarter of its Bloch wall width), the nucleation field is negative while the coercivity saturates at 0.414HK, where HK is the anisotropy field. Thus for larger L, the coercivity mechanism is self-pinning rather than pure nucleation. This self-pinning has both attributes of traditional nucleation and pinning. © 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2009.02.029
Appears in Collections:Staff Publications

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