Magnetic effects at the interface between nonmagnetic oxides


Brinkman, A. and Huijben, M. and Zalk, M. van and Huijben, J. and Zeitler, U. and Maan, J.C. and Wiel, W.G. van der and Rijnders, G. and Blank, D.H.A. and Hilgenkamp, H. (2007) Magnetic effects at the interface between nonmagnetic oxides. Nature Materials, 6 (7). pp. 493-496. ISSN 1476-1122

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Abstract:The electronic reconstruction at the interface between two insulating oxides can give rise to a highly conductive interface. Here we show how, in analogy to this remarkable interfaceinduced conductivity, magnetism can be induced at the interface between the otherwise non-magnetic insulating perovskites SrTiO3 and LaAlO3. A large negative magnetoresistance of the interface is found, together with a logarithmic temperature dependence of the sheet resistance.At lowtemperatures, the sheet resistance reveals magnetic hysteresis.Magnetic ordering is a key issue in solid-state science and its underlying mechanisms are still the subject of intense research. In particular, the interplay between localized magnetic moments and the spin of itinerant conduction electrons in a solid gives rise to intriguingmany-body effects such as Ruderman–Kittel–Kasuya–Yosida interactions3, the Kondo effect4 and carrier-induced ferromagnetism in diluted magnetic semiconductors5. The conducting oxide interface now provides a versatile system to induce and manipulate magnetic moments in otherwise non-magnetic materials.
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Copyright:© 2007 Nature Publishing Group
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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