Giant low-field magnetocaloric effect and refrigerant capacity in reduced dimensionality EuTiO3 multiferroics

Raja Das, R. Prabhu, N. Venkataramani, Shiva Prasad, Ling Li, Manh Huong Phan, Veerle Keppens, David Mandrus, Hariharan Srikanth

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Engineering magnetic materials into a thin film form while preserving its excellent magnetocaloric response is essential in the development of miniature magnetic coolers. We demonstrate how this can be achieved in the case of EuTiO3 – an emerging multiferroic material. Unlike conventional cases where reduced dimensionality considerably decreased the magnetic entropy change (ΔSM) and hence the refrigerant capacity (RC), we show the large low-field enhancements of ΔSM and RC in a ∼100 nm thick nanocrystalline EuTiO3 film (ΔSM ∼ 24 J kg−1K−1 and RC = 152 J kg-1 for μ0ΔH = 2 T) relative to its single crystal counterpart (ΔSM ∼ 17 J kg−1K−1 and RC ∼ 107 J kg-1 for μ0ΔH = 2 T). The nanocrystalline EuTiO3 film is an excellent candidate for cryogenic magnetic refrigeration. From our study, a new approach for improving both MCE and RC in magnetic nanomaterials is proposed, which will stimulate further research on magnetocaloric thin films and related cooling devices.

Original languageEnglish
Article number156819
JournalJournal of Alloys and Compounds
Volume850
DOIs
Publication statusPublished - 05 Jan 2021
Externally publishedYes

Keywords

  • Magnetic refrigeration
  • Magnetocaloric effect
  • Multicaloric oxides

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