Anisotropic magnetocaloric effect in antiferromagnetic systems: Application to EuTiO3

作者：Alho B P^*; Carvalho A Magnus G; von Ranke P J

来源：Journal of Applied Physics, 2014, 116(11): 113907.

DOI：10.1063/1.4895996

In this work, we theoretically predicted an anisotropic magnetocaloric effect of the same order of magnitude of the usual magnetocaloric effect for antiferromagnetic systems. The anisotropic magnetic properties come from the anti-parallel alignment of the magnetic sites and can be optimized depending on the magnetic field change. This result highlights the applicability of antiferromagnetic compounds as refrigerants based on the anisotropic magnetocaloric effect. For this purpose, we considered a Hamiltonian model, including the exchange and Zeeman interactions in a two sublattices framework. It is worth noting that no anisotropy is explicitly included on the Hamiltonian model, although the system presents an anisotropic behavior. The calculations were applied to the G-type antiferromagnetic compound EuTiO3.

• 出版日期2014-9-21