Exchange-bias effect at La0.75Sr0.25MnO3/LaNiO3 interfaces

Authors:

J. C. Rojas Sánchez
J. C. Rojas Sánchez
BNB. Nelson-Cheeseman
B. Nelson-Cheeseman
MGM. Granada
M. Granada
EAE. Arenholz
E. Arenholz
L. B. Steren
L. B. Steren

26 March 2012

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 85 (9)
DOI:10.1103/physrevb.85.094427

Abstract

We show that ferromagnetic/paramagnetic La0.75Sr0.25MnO3/LaNiO3 multilayers present an unexpected magnetic exchange-bias effect (EBE), observed in field-cooled magnetization loops. The exchange-bias field and the enhancement of the coercivity vanish around 50 K. We demonstrate that the oxidation state of the Ni and Mn cations changes from Mn3+-Ni3+ to Mn4+-Ni2+ in the layers close to the interface probed by x-ray absorption spectroscopy measurements. The variation of the valence states is accompanied by a change in the magnetic behavior of the cations at the La0.75Sr0.25MnO3/LaNiO3 interface, possibly giving rise to the formation of magnetic or magnetically frustrated regions that may pin the ferromagnetic La0.75Sr0.25MnO3 layers and explain the EBE.

Keywords

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