Electric field induced changes in the coercivity of a thin-film ferromagnet

Fowley C., Rode K., Oğuz K., Kurt H. , Coey J. M. D.

JOURNAL OF PHYSICS D-APPLIED PHYSICS, cilt.44, sa.30, 2011 (SCI İndekslerine Giren Dergi) identifier identifier


Data are presented which indicate a modification of magnetic anisotropy in the MgO/CoFeB/Pd and MgO/CoFeB/Pt systems, using electric fields of order 500 MV m(-1) (0.5 V nm(-1)) applied across a thermally grown SiO(2) as a gate dielectric. The effect is most prominent at low temperature (12 K) and is manifested as a small change in coercivity. The sign of the effect depends on the choice of both capping layer and annealing temperature. The results suggest that both interfaces play a role in the appearance of perpendicular magnetic anisotropy in these thin-film stacks, and not just the interface with MgO.