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Giant and reversible extrinsic magnetocaloric effects in La0.7Ca0.3MnO3 films due to strain

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arxiv 1209.6516 v1 pith:D5RO56FO submitted 2012-09-28 cond-mat.mtrl-sci

X. Moya , L. E. Hueso , F. Maccherozzi , A. I. Tovstolytkin , D. I. Podyalovskii , C. Ducati , L. C. Phillips , M. Ghidini
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O. Hovorka A. Berger M. E. Vickers E. Defaÿ S. S. Dhesi N. D. Mathur
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classification cond-mat.mtrl-sci
keywords effectsgiantmagnetocaloricextrinsicfilmsmagneticmaterialsmno3
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Large thermal changes driven by a magnetic field have been proposed for environmentally friendly energy efficient refrigeration, but only a few materials which suffer hysteresis show these giant magnetocaloric effects. Here we create giant and reversible extrinsic magnetocaloric effects in epitaxial films of the ferromagnetic manganite La0.7Ca0.3MnO3 using strain mediated feedback from BaTiO3 substrates near a first-order structural phase transition. Our findings should inspire the discovery of giant magnetocaloric effects in a wide range of magnetic materials, and the parallel development of nanostructured bulk samples for practical applications.

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