Nucleation field, hysteresis loop, coercivity mechanism and critical thickness in composite multilayers with perpendicular anisotropy |
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| Authors: | N. Bo H.W. Zhang X.B. Wang |
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| Affiliation: | a College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, Chinab State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, Chinac National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, Chinad School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore |
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| Abstract: | Analytical expression for the nucleation field has been derived for a hard/soft multilayer system with anisotropy perpendicular to the film plane, which depends on the soft thickness Ls, the interface exchange coupling constant Ji and the intrinsic material parameters. Both nucleation field and coercivity decrease as Ls increases. For very small Ls, the coercivity mechanism is pure nucleation and the hysteresis loops are square. As Ls rises, the coercivity mechanism changes from nucleation to pinning gradually, where the hysteresis loops have to be calculated numerically. The critical thickness at which the mechanism varies has been discussed in detail on the basis of easy axis orientation and the interface exchange coupling constant. |
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| Keywords: | A. Composite multilayers C. Hysteresis loop D. Micromagnetics |
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