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Title: Emergent nanoscale superparamagnetism at oxide interfaces
Authors: Anahory, Y.
Embon, L.
Li, C. J. 
Banerjee, S.
Meltzer, A.
Naren, H. R.
Yakovenko, A.
Cuppens, J.
Myasoedov, Y.
Rappaport, M. L.
Huber, M. E.
Michaeli, K.
Venkatesan, T. 
Ariando A. 
Zeldov, E.
Issue Date: 25-Apr-2015
Publisher: Nature Publishing Group
Citation: Anahory, Y., Embon, L., Li, C. J., Banerjee, S., Meltzer, A., Naren, H. R., Yakovenko, A., Cuppens, J., Myasoedov, Y., Rappaport, M. L., Huber, M. E., Michaeli, K., Venkatesan, T., Ariando A., Zeldov, E. (2015-04-25). Emergent nanoscale superparamagnetism at oxide interfaces. NATURE COMMUNICATIONS 7. ScholarBank@NUS Repository.
Abstract: Atomically sharp oxide heterostructures exhibit a range of novel physical phenomena that are absent in the parent compounds. A prominent example is the appearance of highly conducting and superconducting states at the interface between LaAlO 3 and SrTiO 3. Here we report an emergent phenomenon at the LaMnO3/SrTiO3 interface where an antiferromagnetic Mott insulator abruptly transforms into a nanoscale inhomogeneous magnetic state. Upon increasing the thickness of LaMnO3, our scanning nanoSQUID-on-tip microscopy shows spontaneous formation of isolated magnetic nanoislands, which display thermally activated moment reversals in response to an in-plane magnetic field. The observed superparamagnetic state manifests the emergence of thermodynamic electronic phase separation in which metallic ferromagnetic islands nucleate in an insulating antiferromagnetic matrix. We derive a model that captures the sharp onset and the thickness dependence of the magnetization. Our model suggests that a nearby superparamagnetic-ferromagnetic transition can be gate tuned, holding potential for applications in magnetic storage and spintronics. © The Author(s) 2016.
ISSN: 2041-1723
DOI: 10.1038/ncomms12566
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