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In the present study, we investigated magnetodielectric, magnetoelectric(ME), and angular-dependent polarization in single-crystal Fe4Nb2O9. Themagnetodielectric effects in epsilon(x) (x//[100]), epsilon(y) (y//[120]), andepsilon(z) (z//[001]) are found to be significant only around T-N approximateto 95 K when magnetic fields are applied along three orthogonal x-, y-(y//[120]), and z directions. The finite polarization P-x, P-y, and P-z of 70,100, and 30 mu C/m(2), respectively, can be induced in the antiferromagneticphase when a finite magnetic field up to 9 T is applied along the threeorthogonal directions. The angular-dependent polarization measurements verifythe dominating linear ME effects below T-N. From the above experimentalresults, a linear ME tensor a(ij) with all nine nonzero components can beinferred, demonstrating a much lower magnetic point group of -1' for the cantedantiferromagnetic configuration.

Probing magnetic symmetry in antiferromagnetic Fe4Nb2O9 single crystals by linear magnetoelectric tensor