Relaxor-like improper ferroelectricity induced by S-i center dot S-j-type collinear spin ordering in a M-type hexaferrite PbFe6Ga6O19
SCIE
SCOPUS
- Title
- Relaxor-like improper ferroelectricity induced by S-i center dot S-j-type collinear spin ordering in a M-type hexaferrite PbFe6Ga6O19
- Authors
- Eun Hye Na; Seungwoo Song; Koo, YM; Jang, HM
- Date Issued
- 2013-12
- Publisher
- Elsevier Ltd.
- Abstract
- M-type hexaferrites with the magnetoplumbite structure are industrially mass produced uniaxial magnets that possess the simplest crystal structure among various hexaferrites. Herein we present an intriguing phenomenon of relaxor-like ferroelectricity observed in a M-type hexaferrite PbFe6Ga6O19 (PFGO) single crystal. The unique feature of the present discovery is that the improper polarization (similar to 30 nC cm(-2) at 5 K) with a direction parallel to hexagonal [1 (1) over bar 0] arises from the collinear S-i . S-j-type spin exchange coupling. This collinear coupling, in turn, is triggered by selective local spin reversal of the Fe3+ magnetic moment at the octahedral 2a sublattice. The frequency-dependent dielectric data indicated relaxor-like responses of PFGO with the Vogel-Fulcher freezing temperature of similar to 17 K. This freezing temperature for the polar-cluster reorientation coincided with the onset of a rapid decrease in polarization with temperature. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- Keywords
- Improper ferroelectricity; Collinear spin ordering; Relaxor ferroelectric; Selective local spin reversal; M-type hexaferrites; ELECTRIC POLARIZATION; PHASE-TRANSITION; TEMPERATURE; CRYSTALS; BEHAVIOR
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14618
- DOI
- 10.1016/J.ACTAMAT.2013.09.007
- ISSN
- 1359-6454
- Article Type
- Article
- Citation
- ACTA MATERIALIA, vol. 61, no. 20, page. 7705 - 7711, 2013-12
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