Magnetocaloric effect and piezoresponse of engineered ferroelectric-ferromagnetic heterostructures

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:473

Article

Vats, Gaurav¹  Ravikant^2,3  Kumari, Shalini⁴  Pradhan, Dhiren K.⁵  Katiyar, Ram S.^6,7  Ojha, V. N.^2,3  Bowen, Chris R.⁸  Kumar, Ashok^2,3 

[1] Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[2] Natl Phys Lab, CSIR, Dr KS Krishnan Marg, New Delhi 110012, India

[3] Natl Phys Lab, CSIR, Acad Sci & Innovat Res AcSIR, Dr KS Krishnan Marg, New Delhi 110012, India

[4] West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA

[5] Carnegie Inst Sci, Geophys Lab, Extreme Mat Initiat, 5251 Broad Branch Rd NW, Washington, DC 20015 USA

[6] Univ Puerto Rico, Dept Phys, San Juan, PR 00931 USA

[7] Univ Puerto Rico, Inst Funct Nanomat, San Juan, PR 00931 USA

[8] Univ Bath, Mat Res Ctr, Dept Mech Engn, Bath BA2 7AY, Avon, England

关键词: Magnetocaloric effect;    Magneto-electric coupling;    Lattice strains;    Multi-layered heterostructures;   

DOI  :  10.1016/j.jmmm.2018.10.024

来源: Elsevier

【 摘 要 】

This study reports the magnetocaloric effect (MCE) and piezoresponse of integrated ferroelectric-ferromagnetic heterostructures of PbZr0.52Ti0.48O3 (PZT) (5 nm)/Bi-Sr-Ca-Cu-2-O-x (BSCCO) (5 nm)/La0.67Sr0.33MnO3 (LSMO) (40 nm)/MgO (0 01). 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 (vertical bar Delta s vertical bar) of 42.6 mJkg(-1)K(-1) (at 258 K) and 41.7 mJkg(-1)K(-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.

【 授权许可】

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