Magnetoelectric behaviour of ferrimagnetic BixCo2-xMnO4 (x=0, 0.1 and 0.3) thin films
نویسندگان
چکیده
Thin films of BixCo2-xMnO4 (x = 0, 0.1 and 0.3) were grown on quartz, LaAlO3 (LAO) and YBa2Cu3O7 (YBCO) buffer layer coated-LAO substrates by pulsed laser deposition (PLD). X-ray diffraction (XRD) and Raman scattering measurements showed that the thin films exhibit single phase polycrystalline cubic spinel structure on all the substrates. Near edge x-ray absorption fine structure (NEXAFS) studies confirmed the octahedral occupancy of the substituted Bi ions. Temperature dependent zero field cooled (ZFC) magnetization measurements show the ferrimagnetic (FM) behavior (TC ~ 186 K) and magnetization undergoes a cross-over from positive to negative, owing to the opposite contributions of magnetic moments from Co and Mn ions. A weak ferroelectric property exhibited by the films above room temperature was evidenced through the Capacitance-Voltage (C-V) and dielectric measurements. Magnetoelectric coupling was found maximum just below the FM-TC.
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Multiferroic Properties of BiSubstituted Co2MnO4
Single phase polycrystalline samples of BixCo2-xMnO4 (x = 0.0, 0.1 and 0.3) were synthesized by conventional solid state reaction. The crystallographic structure of all samples is found to be cubic spinel (space group Fd3m). Partial substitution of Bi3+ in place of Co3+ varies the ferroelectric and ferrimagnetic transition temperatures. The magnetocapacitive effect exhibited in the temperature ...
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