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A spin‐calorics device based on La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattices
Author(s) -
Ziese M.
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105318
Subject(s) - superlattice , condensed matter physics , magnetoresistance , magnetic refrigeration , materials science , magnetization , exchange bias , pulsed laser deposition , magnetic field , magnetic anisotropy , thin film , nanotechnology , physics , quantum mechanics
High quality La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattices with ultrathin individual layers were grown by pulsed laser deposition and were studied by magnetometry and magnetoresistance measurements. Depending on layer thickness and structural quality, exchange biasing could be observed both in magnetization and magnetotransport. In this regime the superlattice magnetization forms an exchange spring that leads to a reversible field dependence of the magnetoresistance and the magnetic work. It is shown that the magnetic work and the magnetocaloric effect can be tuned by the SrRuO 3 layer thickness. This opens up the possibility of fabricating spin‐caloric devices from wedge‐shaped superlattices with self‐sustaining Seebeck effect. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)