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Prediction of a Giant Magnetoelectric Cross-Caloric Effect around a Tetracritical Point in Multiferroic SrMnO3 by Edström, Alexander; Ederer, Claude is a Physics and Astronomy article available to read on EtoBox.

What is Prediction of a Giant Magnetoelectric Cross-Caloric Effect around a Tetracritical Point in Multiferroic SrMnO3 about?

We study the magnetoelectric and electrocaloric response of strain-engineered, multiferroic SrMnO\_{3}, using a phenomenological Landau theory with all parameters obtained from first-principles-based calculations. This allows us to make realistic semiquantitative and materials-specific predictions about the magnitude of the corresponding effects. We find that in the vicinity of a tetracritical point, where magnetic and ferroelectric phase boundaries intersect, an electric field has a huge effect on the antiferromagnetic order, corresponding to a magnetoelectric response several orders of magnitude larger than in conventional linear magnetoelectrics. Furthermore, the strong magnetoelectric coupling leads to a magnetic, cross-caloric contribution to the electrocaloric effect, which increases the overall caloric response by about 60%. This opens up new potential applications of antiferromagnetic multiferroics in the context of environmentally friendly solid state cooling technologies.

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Author

Edström, Alexander; Ederer, Claude

Publisher

The American Physical Society; American Physical Society; American Physical Society (APS) (ISSN 0031-9007)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)