Pyroelectric control of magnetization for tuning thermomagnetic energy conversion and magnetocaloric effect

Gaurav Vats, Ashok Kumar, Nora Ortega, Chris R. Bowen, Ram S. Katiyar

Research output: Contribution to journalArticle

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Abstract

Tri-layered PbZr0.53Ti0.47O3/CoFe2O4/PbZr0.53Ti0.47O3 (PZT/CFO/PZT) nanostructures have been reported to have the highest pyroelectric energy harvesting and electrocaloric effect. These nanostructures are magnetically active and the resultant 'giant' effects are considered to be governed by dynamic magneto-electric coupling. Therefore, it is of interest to investigate such nanostructures for thermomagnetic energy conversion and its corresponding magnetocaloric effect (MCE). In this context, the present study reveals that ferroelectric/magnetic/ferroelectric multilayered nanostructures of PZT/CFO/PZT can be used to achieve pyroelectric control over magnetization even in the absence of an applied electric field. Using the same phenomena, the coexistence of a 'giant' positive and a negative MCE is attained in the tri-layered PZT/CFO/PZT nanostructures for identical temperature ranges, but with different levels of applied magnetic field. Unlike conventional structural phase transitions based MCE effects, the present study demonstrates the possibility of obtaining a giant MCE simply by pyroelectric control of magnetism. The MCE entropy changes (ΔS(H)max = 1.5 J kg-1 K-1 for inverse MCE and 18.15 J kg-1 K-1 for positive MCE at 245 K) calculated using Maxwell equations are found to be as large as those reported for existing giant MCE systems. Moreover, our investigation of the thermomagnetic energy conversion in these nanostructures indicate that the tri-layer configuration also has a giant thermomagnetic energy conversion efficiency of 41% relative to that obtained using the Carnot cycle.

LanguageEnglish
Pages2383-2391
Number of pages9
JournalEnergy & Environmental Science
Volume9
Issue number7
Early online date25 May 2016
DOIs
StatusPublished - 1 Jul 2016

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Magnetocaloric effects
Energy conversion
magnetization
Magnetization
Tuning
Nanostructures
Ferroelectric materials
Carnot cycle
effect
energy conversion
Energy harvesting
Magnetism
Maxwell equations
Conversion efficiency
Entropy
Phase transitions
Electric fields
phase transition
Magnetic fields
coexistence

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Pyroelectric control of magnetization for tuning thermomagnetic energy conversion and magnetocaloric effect. / Vats, Gaurav; Kumar, Ashok; Ortega, Nora; Bowen, Chris R.; Katiyar, Ram S.

In: Energy & Environmental Science, Vol. 9, No. 7, 01.07.2016, p. 2383-2391.

Research output: Contribution to journalArticle

Vats, Gaurav ; Kumar, Ashok ; Ortega, Nora ; Bowen, Chris R. ; Katiyar, Ram S./ Pyroelectric control of magnetization for tuning thermomagnetic energy conversion and magnetocaloric effect. In: Energy & Environmental Science. 2016 ; Vol. 9, No. 7. pp. 2383-2391
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