Magnetocaloric effect and piezoresponse of engineered ferroelectric-ferromagnetic heterostructures

Gaurav Vats, Ravikant, Shalini Kumari, Dhiren Pradhan, Ram Katiyar, V. N. Ojha, Christopher Bowen, Ashok Kumar

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Abstract

This study reports the magnetocaloric effect (MCE) and piezoresponse of integrated ferroelectric-ferromagnetic heterostructures of PbZr 0.52Ti 0.48O 3 (PZT) (5 nm)/Bi-Sr-Ca-Cu 2-O X (BSCCO) (5 nm)/La 0.67Sr 0.33MnO 3 (LSMO) (40 nm)/MgO (0 0 1). Magnetic and pizoresponse behavior of the heterostructures are found to be governed by magneto-electric coupling and induced lattice strains. In addition, a maximum MCE is studied using Maxwell equations from both Field Cooled (FC) and Zero Field Cooled (ZFC) magnetization data. Maximum MCE entropy change (|ΔS|) of 42.6 mJkg −1K −1 (at 258 K) and 41.7 mJkg −1K −1 (at 269 K) are found corresponding to FC and ZFC data, respectively. The variation in maximum entropy change and corresponding temperatures for FC and ZFC data revealed that the application of a magnetic field can significantly contribute towards tuning of the MCE. Interestingly, these multilayered structures are found to sustain MCE over a broad temperature range, which makes them attractive for improved solid-state energy conversion devices.

Original languageEnglish
Pages (from-to)511-516
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume473
Early online date6 Oct 2018
DOIs
Publication statusPublished - 1 Mar 2019

Keywords

  • Lattice strains
  • Magneto-electric coupling
  • Magnetocaloric effect
  • Multi-layered heterostructures

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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