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Prediction of a giant magnetoelectric cross-caloric effect around a tetracritical point in multiferroic SrMnO3
Physical Review Letters ( IF 9.227 ) Pub Date : 
Alexander Edström and Claude Ederer

We study the magnetoelectric and electrocaloric response of strain-engineered, multiferroic , using a phenomenological Landau theory with all parameters obtained from -based calculations. This allows to make realistic {semi-quantitative} 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.
更新日期:2020-03-26

 

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