Magnetic-field induced competition of two multiferroic orders in a triangular-lattice helimagnet MnI2.
Phys Rev Lett
; 106(16): 167206, 2011 Apr 22.
Article
em En
| MEDLINE
| ID: mdl-21599411
ABSTRACT
Magnetic and dielectric properties with varying magnitude and direction of magnetic-field H have been investigated for a triangular-lattice helimagnet MnI_{2}. The in-plane electric polarization P emerges in the proper screw magnetic ground state below 3.5 K, showing the rearrangement of six possible multiferroic domains as controlled by the in-plane H. With every 60° rotation of H around the [001] axis, discontinuous 120° flop of the P vector is observed as a result of the flop of magnetic modulation vector q. With increasing the in-plane H above 3 T, however, the stable q direction changes from qâ(110[ ¯over 0]) to qâ(110), leading to a change of P-flop patterns under rotating H. At the critical field region (â¼3 T), due to the phase competition and resultant enhanced q flexibility, the P vector smoothly rotates clockwise twice while the H vector rotates counterclockwise once.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Japão