Grain size-dependent magnetic and electric properties in nanosized YMnO3 multiferroic ceramics

Nanoscale Research Letters - Tập 6 Số 1
T. C. Han1, Wei‐Yen Hsu1, Wei-Da Lee1
1Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan

Tóm tắt

AbstractMagnetic and electric properties are investigated for the nanosized YMnO3 samples with different grain sizes (25 nm to 200 nm) synthesized by a modified Pechini method. It shows that magnetic and electric properties are strongly dependent on the grain size. The magnetic characterization indicates that with increasing grain size, the antiferromagnetic (AFM) transition temperature increases from 52 to 74 K. A corresponding shift of the dielectric anomaly is observed, indicating a strong correlation between the electric polarization and the magnetic ordering. Further analysis suggests that the rising of AFM transition temperature with increasing grain size should be from the structural origin, in which the strength of AFM interaction as well as the electrical polarization is dependent on the in-plane lattice parameters. Furthermore, among all samples, the sample with grain size of 95 nm is found to have the smallest leakage current density (< 1 μA/cm2).PACS: 75.50.Tt, 75.50.Ee, 75.85.+t, 77.84.-s

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Nanoscale Research Letters

Tập 6 Số 1

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