Abstract
Comparative studies of magnetoelectric susceptibility (), magnetization (), and magnetostriction () in TbMnO reveal that the increment of owing to the field-induced Tb spin alignment produces a field-asymmetric line shape in the curve, which is conspicuous in a low-temperature incommensurate phase but persistently subsists in the entire ferroelectric phase. Correlations among electric polarization, , and variation represent linear relationships, unambiguously showing the significant role of Tb magnetoelastic effects on the low-field magnetoelectric phenomena of TbMnO. An effective free energy capturing the observed experimental features is also suggested.
- Received 1 November 2010
DOI:https://doi.org/10.1103/PhysRevB.83.060405
©2011 American Physical Society