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MA: Fachverband Magnetismus

MA 37: Multiferroic Oxide Thin Films and Heterostructures II (joint session KFM/TT/MA)

MA 37.7: Talk

Wednesday, March 14, 2018, 17:15–17:30, EMH 225

Magnetoelectric coupling and multicaloric effects in SrMnO₃ — Alexander Edström and •Claude Ederer — Materials Theory, ETH Zürich, Switzerland

SrMnO₃ is a G-type antiferromagnet where ferroelectricity can be induced by epitaxial strain or Ba-substitution. Furthermore, a transition to ferromagnetic order has been predicted under large tensile strain [1], and the two ordering temperatures can in principle be tuned to coincide by varying both strain and composition. SrMnO₃ is thus a very rare example of a multiferroic with proper ferroelectric and magnetic order and similar ordering temperatures.

We use first principles electronic structure calculations in combination with first-principles-derived effective model Hamiltonians to obtain the temperature and strain-dependent ferroelectric/magnetic phase diagram of SrMnO₃. We then explore coupling effects between the polar and magnetic order. A particular focus thereby are possible multi-caloric effects, i.e., adiabatic temperature changes induced by applied electric and/or magnetic fields, that are very promising for future solid state cooling devices [2].

[1] J. H. Lee and K. M. Rabe, Phys. Rev. Lett. 104, 207204 (2010).

[2] X. Moya, S. Kar-Narayan, and N. D. Mathur, Nature Mater. 13, 439 (2014).