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Giant improper ferroelectricity in the ferroaxial magnet CaMn 7O 12

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...

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Authors


Johnson, RD More by this author
Chapon, LC More by this author
Khalyavin, DD More by this author
Radaelli, PG More by this author
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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

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