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| Initial Magnetization and Coercivity Mechanism in Amorphous TbxCo1-xThin Films with Perpendicular Anisotropy |
| Journal of Magnetics, Volume 15, Number 4, 31 Dec 2010, Pages 169-172 |
Taewan Kim (Department of Advanced Materials Engineering, Sejong University), Hana Lee (Department of Advanced Materials Engineering, Sejong University), Hyun-Yong Lee (Faculty of Applied Chemical Engineering, Chonnam National University), Kyoung-il Lee *  (Nano Convergence Device Center, Korea Institute of Science and Technology) |
| Abstract |
The coercivity mechanism in permanent magnets was analyzed according to the effects of domain nucleation and domain wall pinning. The coercivity mechanism of a TbCo thin film with high perpendicular magnetic anisotropy was considered in terms of the local inhomogeneity in the thin film. The initial magnetization curves of the TbCo thin films demonstrated domain wall pinning to be the main contributor to the coercivity mechanism than domain nucleation. Based on the coercivity model proposed by Kronmüller et al., the inhomogeneity size acting as a domain wall pinning site was determined. Using the measured values of perpendicular anisotropy constant (Ku), saturation magnetization (Ms), and coercivity (Hc), the inhomogeneity size estimated in a TbCo thin film with high coercivity was approximately 9 nm.
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| Keywords: TbCo; perpendicular anisotropy; domain wall; nucleation |
| DOI: 10.4283/JMAG.2010.15.4.169 |
| Full Text: PDF |
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