Abstract
We report the observation of magnetoelectric and magnetodielectric effects at different temperatures in Mn-substituted yttrium orthoferrite, . Substitution of Mn in antiferromagnetic induces a first-order spin-reorientation transition at a temperature, , which increases with whereas the Néel temperature () decreases. While the magnetodielectric effect occurs at and , the ferroelectricity appears rather at low temperatures. The origin of magnetodielectric effect is attributed to spin-phonon coupling as evidenced from the temperature dependence of Raman phonon modes. The large magnetocapacitance (18% at 50 kOe) near and high ferroelectric transition temperature () observed for suggest routes to enhance magnetoelectric effect near room temperature for practical applications.
- Received 30 May 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.137202
© 2011 American Physical Society