Investigations on magnetostatic interactions among CoFeB layers with perpendicular anisotropy in [Ta/CoFeB/MgO]N multilayers

The magnetostatic interactions among CoFeB layers with perpendicular anisotropy are studied in [Ta/CoFeB/MgO]N multilayers by measured loops, magnetic domains, and a simple model. With increasing repeat number N or decreasing separation thickness d between adjacent CoFeB layers, higher magnetostatic...

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Veröffentlicht in:Journal of applied physics 2014-05, Vol.115 (17)
Hauptverfasser: Hao, Liang, Cao, Jiangwei, Liu, Mingfeng, Dang, Honggang, Jin, Tianli, Wang, Ying, Wei, Fulin, Wei, Dan
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Sprache:eng
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Zusammenfassung:The magnetostatic interactions among CoFeB layers with perpendicular anisotropy are studied in [Ta/CoFeB/MgO]N multilayers by measured loops, magnetic domains, and a simple model. With increasing repeat number N or decreasing separation thickness d between adjacent CoFeB layers, higher magnetostatic interaction among CoFeB layers results in bow-tie shape perpendicular loops and shrinking of domain size at remanence state. The measured nucleation field Hn of bow-tie shape perpendicular loops can be explained by a simple theoretical model including the intralayer and interlayer magnetostatic interactions among CoFeB layers with a certain domain size.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4868924