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Magnetocaloric effect and improved relative cooling power in (La 0.7 Sr 0.3 MnO 3 /SrRuO 3 ) superlattices

Zhang, Q and Thota, S and Guillou, F and Padhan, P and Hardy, V and Wahl, A and Prellier, W (2011) Magnetocaloric effect and improved relative cooling power in (La 0.7 Sr 0.3 MnO 3 /SrRuO 3 ) superlattices. Journal of Physics: Condensed Matter, 23 (5). 052201.

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Official URL: http://stacks.iop.org/0953-8984/23/i=5/a=052201

Abstract

Magnetic properties of a series of (La 0.7 Sr 0.3 MnO 3 / SrRuO 3 ) superlattices, where the SrRuO 3 layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obtained owing to the finite size effect which reduces the T C of La 0.7 Sr 0.3 MnO 3 layers. While the working temperature ranges are enlarged, − Δ S M max values remain similar to the values in polycrystalline La 0.7 Sr 0.3 MnO 3 . Consequently, the relative cooling powers are significantly improved, the microscopic mechanism of which is related to the effect of the interfaces at La 0.7 Sr 0.3 MnO 3 / SrRuO 3 and higher nanostructural disorder. This study indicates that artificial oxide superlattices/multilayers might provide an alternative pathway in searching for efficient room-temperature magnetic refrigerators for (nano) micro-scale systems.

Item Type:Article
ID Code:11162
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:24
Last Modified:02 Nov 2011 00:47

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