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Inicio » Actividades I+D > Publicaciones 2012 > Exchange-bias effect at La0.75Sr0.25MnO3...
artículo con referato
"Exchange-bias effect at La0.75Sr0.25MnO3/LaNiO3 interfaces"
J.C. Rojas Sánchez, B. Nelson-Cheeseman, M. Granada, E. Arenholz and L.B. Steren
Phys. Rev. B 85(9) (2012) 094427/1-5
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.
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