Controlled reversal of coupled Néel walls in flux-closure magnetic trilayer elements

Huang, L.; Zhu, Y.
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p222502
Academic Journal
We report the detailed field-induced transformation of coupled Néel walls in micron-sized trilayer elliptical elements for novel domain-wall-based device applications. Using in situ Lorentz transmission electron microscopy and micromagnetic simulation, we demonstrate that the magnetostatically coupled composite wall structure can be switched controllably without affecting the overall flux-closure domain configuration via separate translation of vortex cores in the two magnetic layers. The top and bottom Néel walls either trap or expel each other depending on the relative orientation of their magnetization directions, leading to the interesting domain switching behavior observed during magnetization reversal.


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