Enhanced magnetocaloric effect driven by interfacial magnetic coupling in self-assembled Mn3O4-La0.7Sr0.3MnO3 nanocomposites

Suresh K. Vandrangi, Jan Chi Yang, Yuan Min Zhu, Yi Ying Chin, Hong Ji Lin, Chien Te Chen, Qian Zhan, Qing He, Yi Chun Chen, Ying-hao Chu*

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Magnetic refrigeration, resulting from the magnetocaloric effect of a material around the magnetic phase-transition temperature, is a topic of great interest as it is considered to be an alternate energy solution to conventional vapor-compression refrigeration. The viability of a magnetic refrigeration system for magnetic cooling can be tested by exploiting materials in various forms, from bulk to nanostrucutres. In this study, magnetocaloric properties of self-assembled Mn3O4-La0.7Sr0.3MnO3 nanocomposites, with varying doping concentrations of Mn3O4 in the form of nanocrystals embedded in the La0.7Sr0.3MnO3 matrix, are investigated. The temperatures corresponding to the paramagnetic-to-ferromagnetic transitions are higher, and the values of change in magnetic entropy under a magnetic field of 2 T show an enhancement (highest being ∼130%) for the nanocomposites with low doping concentrations of Mn3O4, compared to that of pure La0.7Sr0.3MnO3 thin films. Relative cooling power remain close to those of La0.7Sr0.3MnO3. The enhanced magnetic phase-transition temperature and magnetocaloric effect are interpreted and evidenced in the framework of interfacial coupling between Mn3O4 and La0.7Sr0.3MnO3. This work demonstrates the potentiality of self-assembled nanostructures for magnetic cooling near room temperature under low magnetic fields.

Original languageEnglish
Pages (from-to)26504-26511
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number48
DOIs
StatePublished - 9 Dec 2015

Keywords

  • complex oxides
  • magnetocalorics
  • manganites
  • nanocomposites
  • thin films

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    Vandrangi, S. K., Yang, J. C., Zhu, Y. M., Chin, Y. Y., Lin, H. J., Chen, C. T., Zhan, Q., He, Q., Chen, Y. C., & Chu, Y. (2015). Enhanced magnetocaloric effect driven by interfacial magnetic coupling in self-assembled Mn3O4-La0.7Sr0.3MnO3 nanocomposites. ACS Applied Materials and Interfaces, 7(48), 26504-26511. https://doi.org/10.1021/acsami.5b07585