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

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

2004-05-15

arxiv.org/abs/cond-mat/0405338v1

Physics

Condensed Matter

Other Condensed Matter

accepted to Applied Physics Letters

Scientific paper

10.1063/1.1767955

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 (), and its magnitude increases rapidly as the temperature is lowered below . 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.

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