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

Nature Materials volume 12, pages 52–58 (2013)Cite this article

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Abstract

Large thermal changes driven by a magnetic field have been proposed for environmentally friendly energy-efficient refrigeration, but only a few materials that 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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Figure 1: Structural properties of LCMO∥BTO at room temperature.
Figure 2: Magnetic properties of LSMO∥BTO and LCMO∥BTO.
Figure 3: Local magnetic properties of LCMO∥BTO near the R–O substrate transition.
Figure 4: Extrinsic magnetocaloric effects in LCMO∥BTO near the R–O substrate transition.
Figure 5: Extrinsic and intrinsic magnetocaloric effects for LCMO∥BTO.

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Acknowledgements

The authors thank K. Bhattacharya, M. Bibes, M. J. Calderón, S-W. Cheong, G. Creeth, S. Kar-Narayan, P. B. Littlewood, Ll. Mañosa, A. J. Millis, A. Planes and E. K. H. Salje for illuminating discussions. The authors also thank C. Israel, V. Dzyublyuk and G. Ercolano for assistance. This work was supported by UK EPSRC grants EP/E03389X and EP/E0026206. X.M. acknowledges support from the Herchel Smith Fund, and the Comissionat per a Universitats i Recerca (CUR) del Departament d’Innovació, Universitats i Empresa de la Generalitat de Catalunya. Work at nanoGUNE was supported by funding from the Basque Government under the Etortek Program IE11-304, and the Spanish Consolider-Ingenio 2010 Program, Project No. CSD2006-53. Work at the Institute of Magnetism was supported by the Ukrainian State Fund for Fundamental Researches (Project No. F41.1/020). C.D. acknowledges support from The Royal Society.

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Authors and Affiliations

  1. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, UK

    X. Moya, C. Ducati, L. C. Phillips, M. Ghidini, M. E. Vickers, E. Defay & N. D. Mathur

  2. CIC nanoGUNE Consolider, Tolosa Hiribidea 76, E-20018 Donostia-San Sebastian, Spain

    L. E. Hueso, O. Hovorka & A. Berger

  3. IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain

    L. E. Hueso

  4. Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, UK

    F. Maccherozzi & S. S. Dhesi

  5. Institute of Magnetism, 36b Vernadsky Boulevard, Kyiv 03142, Ukraine

    A. I. Tovstolytkin & D. I. Podyalovskii

  6. Department of Physics, University of Parma, v. le G.P. Usberti 7/A, 43100 Parma, Italy

    M. Ghidini

  7. CEA, LETI, Minatec Campus, 17 Rue des Martyrs, 38054 Grenoble, France

    E. Defay

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  1. X. Moya
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Contributions

N.D.M. suggested the study. X.M. and N.D.M. led the project. X.M. fabricated the samples and performed the XRD, AFM, DSC, and Princeton VSM measurements. X.M. and M.E.V. interpreted the XRD data. L.E.H., with assistance from O.H., performed the SQUID-VSM measurements, and the Quantum Design VSM measurements in Supplementary Fig. S7. S.S.D. led the collection and the analysis of the XMCD-PEEM data. X.M., S.S.D., F.M., L.C.P. and M.G. collected the XMCD-PEEM data. F.M. and S.S.D. analysed the XMCD-PEEM data. A.I.T. and D.I.P. performed and interpreted the FMR measurements. C.D. was responsible for TEM sample preparation and measurements. X.M. and N.D.M. interpreted the key findings. N.D.M. wrote the manuscript with X.M., using substantive feedback from E.D., L.E.H., A.B., M.G., F.M., S.S.D. and A.I.T. Authors M.E.V., C.D., L.C.P. and O.H. also contributed to the preparation of the manuscript.

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Correspondence to N. D. Mathur.

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Moya, X., Hueso, L., Maccherozzi, F. et al. Giant and reversible extrinsic magnetocaloric effects in La0.7Ca0.3MnO3 films due to strain. Nature Mater 12, 52–58 (2013). https://doi.org/10.1038/nmat3463

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