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Strain modulated magnetocaloric effect in (111) oriented La0.7Sr0.3MnO3 – SrRuO3 superlattices.

Abstract

Magnetocaloric effect in (111)-oriented 〖La〗_0.7 〖Sr〗_0.3 MnO_3 (LSMO)–SrRuO_3 (SRO) superlattices grown with both stacking order on (111)-oriented SrTiO_3 (STO) substrates using the pulsed laser deposition technique has been studied. The pseudomorphic growth with 0.64 % in-plane tensile strain in 〖[11 unit cell(u.c.) SRO/3u.c.LSMO]〗_(×15) superlattice is favourable for the larger change in entropy (∆S_M) as compared to the relax growth with -0.64 % in-plane compressive strain in 〖[11u.c.LSMO/3u.c.SRO]〗_(×15) superlattice. The reduction of ∆S_M in 〖[11u.c.LSMO/3u.c.SRO]〗_(×15) could be due to the orientation-dependent in-phase and out-of-phase tilt of the unit cell between ± 1° along the 〈103〉_pc of the {103}_pc, which soften the exchange coupling and leads to the faster alignment of the magnetization near the T_C. The stabilization of the orthorhombic phase of LSMO in the superlattices with both stacking order is evidenced from the existence of anomaly around the T_C of the LSMO and SRO in the temperature-dependent phonon frequency shifts. Reduction in symmetry of LSMO from rhombohedral-to-orthorhombic structure modulates Mn-O-Mn bond length and angles, which induce the spin reorientations and hence, modify the electronic and magnetic properties in these LSMO-SRO superlattices. The ∆S_M of these superlattices suggest that the strain, the magnitude of the magnetic field, volume and magnetization of the ferromagnet can control the magnetocaloric effect. These results will be useful for the designing of devices for the magnetic entropy approach to improve the renewable energy systems.

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Supplementary files

Article information


Accepted
26 Jan 2020
First published
27 Jan 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

Strain modulated magnetocaloric effect in (111) oriented La0.7Sr0.3MnO3 – SrRuO3 superlattices.

R. S. H. , W. Prellier and P. Padhan, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR00620C

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