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Title: Analytical determination of nucleation field and magnetic reversal modes in exchange-coupled nanolayers
Authors: Zhao, G.-P. 
Yang, C.
Xian, C.-W.
Feng, Y.-P. 
Keywords: Nanolayers
Nucleation modes
Reversal mechanism
Issue Date: 10-Oct-2009
Citation: Zhao, G.-P., Yang, C., Xian, C.-W., Feng, Y.-P. (2009-10-10). Analytical determination of nucleation field and magnetic reversal modes in exchange-coupled nanolayers. Modern Physics Letters B 23 (25) : 2955-2961. ScholarBank@NUS Repository.
Abstract: General formulae for coherent/incoherent nucleation fields have been obtained as functions of the thickness of the hard and soft layers within a self-contained micromagnetic model for a hard/soft trilayer. The nucleation modes are determined reliably by direct comparison of the nucleation fields for different modes. It is shown that coherent nucleation cannot take place no matter how small the layer thickness. For small soft layer thickness, the magnetic reversal mode is an incoherent nucleation. As the soft layer thickness increases, the dominant magnetic reversal process is domain-wall motion/pinning. Analyses demonstrate that negative nucleation field and very small coercivity occur when the easy axes of neighboring layers are perpendicular. The results could shade light on Brown's coercivity paradox (where the measured coercivity is much smaller than the one given by the previous theories). © 2009 World Scientific Publishing Company.
Source Title: Modern Physics Letters B
ISSN: 02179849
DOI: 10.1142/S0217984909021119
Appears in Collections:Staff Publications

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