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The necessary correction concerns Eq. ͑2͒ for the transverse magnetoelectric ͑ME͒ coefficient for a bilayer of magnetostrictive and piezoelectric phases. The exact expression given below takes into account the in-plane piezomagnetic coupling q 12 m measured perpendicular to the static magnetic field:The expression reduces to Eq. ͑2͒ for q 11 m ϭq 12 m . Such a condition, however, is not satisfied in nickel ferrite. Our estimation of q 12 m from data on magnetostriction for the ferrite indicates a small positive value for q 12 m ͑compared to a large negative value for q 11 m ͒. The corrected theoretical values of ␣ E,31 are thus a factor of 2 smaller than the estimates in Figs. 6 and 7. The overall good agreement between data and theory claimed in the work, however, is not affected by the correction to calculated values.

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