title: Strain-Engineered Multiferroicity in Pnma NaMnF_{3} Fluoroperovskite.
abstract: In this study we show from first principles calculations the possibility to induce multiferroic and magnetoelectric functional properties in the Pnma NaMnF_{3} fluoroperovskite by means of epitaxial strain engineering. Surprisingly, we found a very strong nonlinear polarization-strain coupling that drives an atypical amplification of the ferroelectric polarization for either compression or expansion of the cell. This property is associated with a noncollinear antiferromagnetic ordering, which induces a weak ferromagnetism phase and makes the strained NaMnF_{3} fluoroperovskite multiferroic. The magnetoelectric response was calculated and it was found to be composed of linear and nonlinear components with amplitudes similar to the ones of Cr_{2}O_{3}. These findings show that it is possible to move the fluoride family toward functional applications with unique responses.
authors.affiliation: Physique Théorique des Matériaux, Université de Liège, B-4000 Sart-Tilman, Belgium.|Centro de Investigación y Estudios Avanzados del IPN, MX-76230 Querétaro, Mexico.
authors.forename: A C
authors.initials: AC
authors.lastname: Garcia-Castro
authors.affiliation: Centro de Investigación y Estudios Avanzados del IPN, MX-76230 Querétaro, Mexico.|Physics Department, West Virginia University, Morgantown, West Virginia 26506-6315, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Romero
authors.affiliation: Physique Théorique des Matériaux, Université de Liège, B-4000 Sart-Tilman, Belgium.
authors.forename: E
authors.initials: E
authors.lastname: Bousquet