Magnetocaloric effect and piezoresponse of engineered ferroelectric-ferromagnetic heterostructures

•Engineered ferroelectric-ferromagnetic heterostructures showed good magnetic response.•Heterostructures are found to sustain a magnetocaloric effect for broad temperature.•These effects are attributed to epitaxial strains and magnetoelectric coupling.•These results may help in development of spintr...

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Published in:Journal of magnetism and magnetic materials 2019-03, Vol.473, p.511-516
Main Authors: Vats, Gaurav, Ravikant, Kumari, Shalini, Pradhan, Dhiren K., Katiyar, Ram S., Ojha, V.N., Bowen, Chris R., Kumar, Ashok
Format: Article
Language:English
Subjects:
Bismuth strontium calcium copper oxide
Differential scanning calorimetry
Energy conversion
Ferroelectric materials
Ferroelectricity
Ferromagnetism
Heterostructures
Lattice strain
Lattice strains
Magnetism
Magneto-electric coupling
Magnetocaloric effect
Maximum entropy
Maximum entropy method
Maxwell's equations
Multi-layered heterostructures
Strontium
Temperature
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Summary:•Engineered ferroelectric-ferromagnetic heterostructures showed good magnetic response.•Heterostructures are found to sustain a magnetocaloric effect for broad temperature.•These effects are attributed to epitaxial strains and magnetoelectric coupling.•These results may help in development of spintronics and solid state refrigerators. This study reports the magnetocaloric effect (MCE) and piezoresponse of integrated ferroelectric-ferromagnetic heterostructures of PbZr0.52Ti0.48O3 (PZT) (5 nm)/Bi-Sr-Ca-Cu2-OX (BSCCO) (5 nm)/La0.67Sr0.33MnO3 (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.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.10.024