Abstract
We report on the control of electric polarization () by using magnetic fields () in a hexaferrite having magnetic order above room temperature (RT). The material investigated is hexagonal , which is a nonferroelectric helimagnetic insulator in the zero-field ground state. By applying , the system undergoes successive metamagnetic transitions, and shows concomitant ferroelectric order in some of the -induced phases with long-wavelength magnetic structures. The magnetoelectrically induced can be rotated 360° by external . This opens up the potential for not only RT magnetoelectric devices but also devices based on the magnetically controlled electro-optical response.
- Received 11 November 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.137201
©2005 American Physical Society