Detection of Magnetocaloric Effects in BaFe₁₁TiO₁₉ Both Directly and Inversely

We report on simulations of BaFe₁₁TiO₁₉’s magnetocaloric effect (MCE) at temperatures between about 4 and 250 K. The MCE in BaFe₁₁TiO₁₉ unexpectedly displays two forms. Among 33 and 204 K, BaFe₁₁TiO₁₉ shows an inverse MCE due to noncollinear ordering. But when the FM goes from 4 to 33 K or over 204 K, a direct MCE is employed. BaFe₁₁TiO₁₉’s advantages may be useful in the hunt for magnetocaloric compounds that exhibit two or more successive magnetic phase changes. BaFe₁₁TiO₁₉ is therefore a very promising magnet for cryogenic refrigeration, with potential uses in the liquefaction and storage of various gases.