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

Liang Hao; Jiangwei Cao; Mingfeng Liu; Honggang Dang; Tianli Jin; Ying Wang; Fulin Wei; Dan Wei

doi:10.1063/1.4868924

journal article Mar 19, 2014

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

Liang Hao

Jiangwei Cao

Mingfeng Liu Honggang Dang Tianli Jin

Ying Wang

Fulin Wei Dan Wei

Journal of Applied Physics Vol. 115 No. 17 · AIP Publishing

View at Publisher Save 10.1063/1.4868924

Abstract

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.

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Published: Mar 19, 2014
Vol/Issue: 115(17)

Authors

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Liang Hao