TITLE

Positive exchange bias in ferromagnetic La0.67Sr0.33MnO3/SrRuO3 bilayers

AUTHOR(S)
Ke, X.; Rzchowski, M. S.; Belenky, L. J.; Eom, C. B.
PUB. DATE
June 2004
SOURCE
Applied Physics Letters;6/28/2004, Vol. 84 Issue 26, p5458
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Epitaxial La0.67Sr0.33MnO3(LSMO)/SrRuO3(SRO) ferromagnetic bilayers have been grown on (001)SrTiO3(STO) substrates by pulsed laser deposition with atomic layer control. We observe a shift in the magnetic hysteresis loop of the LSMO layer in the same direction as the applied biasing field (positive exchange bias). The effect is not present above the Curie temperature of the SRO layer (TcSRO), and its magnitude increases rapidly as the temperature is lowered below TcSRO. The direction of the shift is consistent with an antiferromagnetic exchange coupling between the ferromagnetic LSMO layer and the ferromagnetic SRO layer. We propose that atomic layer charge transfer modifies the electronic state at the interface, resulting in the observed antiferromagnetic interfacial exchange coupling.
ACCESSION #
13495664

 

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