Magnetic anisotropy and magnetodielectric coefficients in Cr2O3 and Fe0.4Cr1.6O3

Abstract The temperature dependence of magnetization, magnetic anisotropy, coercive field and the magnetodielectric coefficient of Cr 2 O 3 (undoped) and Fe 0.4 Cr 1.6 O 3 (doped) was experimentally investigated. Test data shows that the presence of Fe ions at the interstitial spaces of the Cr 2 O 3 crystal lattice decreases the Neel Temperature by ∼80 K when compared to the undoped Cr 2 O 3 . Also both the doped and undoped samples display maxima in magnetic anisotropy and magnetodielectric coefficient as a function of temperature. The maxima for the Fe doped samples occurs at a temperature approximately 80 K below the temperature measured for the Cr 2 O 3 samples, i.e. similar to the shift observed in the Neel Temperature. These results suggest that Neel Temperature, magnetic anisotropy, and the magnetodielectric coefficients are physically interrelated through competing principal exchange interactions and may provide a useful approach to search for new multiferroic materials.