Prediction of a Giant Magnetoelectric Cross-Caloric Effect Around a Tetracritical Point in Multiferroic SrMnO${}_3$

Abstract

We study the magnetoelectric and electrocaloric response of strain-engineered, multiferroic SrMnO${}_3$, using a phenomenological Landau theory with all parameters obtained from \emph{first-principles}-based calculations. This allows to make realistic 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.

6 pages, 3 figures

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Cited by in corpus (8)

• Strain driven antiferromagnetic exchange interaction in SrMnO${}_3$ probed by phase shifted Spin Hall magnetoresistance
• Electrocaloric effects in multiferroics
• Origin of negative electrocaloric effect in Pnma-type antiferroelectric perovskites
• Materials, physics, and systems for multicaloric cooling
• Magnetic and ferroelectric properties of Sr${}_{1-x}$Ba${}_x$MnO${}_3$ from first principles
• Landau theory description of autferroicity
• Magnetoelectrocaloric effect of multiferroic GdFeO3
• Magnetoelectric coupling and its impact on the multicaloric effect