Electric-field modulation of exchange stiffness in MgO/CoFeB with perpendicular anisotropy

preprint2016arXivOpen access

Abstract

We observe magnetic domain structures of MgO/CoFeB with a perpendicular magnetic easy axis under an electric field. The domain structure shows a maze pattern with electric-field dependent isotropic period. We find that the electric-field modulation of the period is explained by considering the electric-field modulation of the exchange stiffness constant in addition to the known magnetic anisotropy modulation.

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