- Abstract:
-
In rhombohedral CaMn 7O 12, an improper ferroelectric polarization of magnitude 2870μCm -2 is induced by an incommensurate helical magnetic structure that evolves below T N1=90K. The electric polarization was found to be constrained to the high symmetry threefold rotation axis of the crystal structure, perpendicular to the in-plane rotation of the magnetic moments. The multiferroicity is explained by the ferroaxial coupling mechanism, which in CaMn 7O 12 gives rise to the largest magnetically...
Expand abstract - Publisher copy:
- 10.1103/PhysRevLett.108.067201
-
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- Journal:
- Physical Review Letters
- Volume:
- 108
- Issue:
- 6
- Publication date:
- 2012-02-06
- DOI:
- EISSN:
-
1079-7114
- ISSN:
-
0031-9007
- URN:
-
uuid:f5251c63-28ee-4b2f-91fb-162fcd31cbdd
- Source identifiers:
-
342966
- Local pid:
- pubs:342966
- Language:
- English
- Copyright date:
- 2012
Journal article
Giant improper ferroelectricity in the ferroaxial magnet CaMn 7O 12
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