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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.

The correct expression for the transverse magnetoelectric voltage coefficient isIt reduces to Eq. ͑1͒ for m q xx ϭ m q yx . For lanthanum strontium manganite ͑LSMO͒, our measurements at room temperature of the in-plane magnetostriction ( yx ) perpendicular to the applied magnetic field direction yielded q yx values that are negative, but much smaller than q xx . Thus the theoretical values of ␣ E,zx are a factor of 2 smaller than the values in Fig. 9. The correction, however, does not alter the observed discrepancy between data and theory, and the conclusions drawn in the studies remain the same.

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