Evolution of ferroelectric and antiferromagnetic phases of TbMn2O5 under high magnetic fields up to 45 T
Abstract
Recent discovery of ferroelectric (FE) polarization reversal/imprint actuated by an external magnetic field in multiferroic TbMn2O5 has opened up promising device application potentials such as magnetically-recorded ferroelectric memory [1]. For better understanding of the interplay between magnetism and ferroelectricity in the multiferroic, we determined high field vs temperature phase diagram of TbMn2O5 from dielectric constant, pyroelectric current and magnetoelectric current measurements (along b axis) under static or pulsed magnetic field (B) (along a axis) up to 45 T. Our results reveal that (1) as B increases, negative FE polarization phase coined with the Mn d-spin reorientation transition below T=25 K at B=0 T expands its region in temperature to merge into the main FE phase boundary below T∼38 K and B∼20 T (2) low temperature positive FE polarization phase stabilized with the ferromagnetic order of Tb f-spin survive up to 25 K under B∼4T. [1] N. Hur et al., Nature 429, 392 (2004).
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2005
- Bibcode:
- 2005APS..MARS43004H