High-temperature magnetic insulating phase in ultrathin La0.67Sr0.33MnO3 films


Boschker, J.A. and Kautz, J. and Houwman, E.P. and Siemons, W. and Blank, D.H.A. and Huijben, M. and Koster, G. and Vailionis, A. and Rijnders, A.J.H.M. (2012) High-temperature magnetic insulating phase in ultrathin La0.67Sr0.33MnO3 films. Physical review letters, 109 (15). 157207-1 - 157207-5. ISSN 0031-9007

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Abstract:We present a study of the thickness dependence of magnetism and electrical conductivity in ultrathin La0.67Sr0.33MnO3 films grown on SrTiO3 (110) substrates. We found a critical thickness of 10 unit cells below which the conductivity of the films disappeared and simultaneously the Curie temperature increased, indicating a magnetic insulating phase at room temperature. These samples have a Curie temperature of about 560 K with a significant saturation magnetization of 1.2±0.2μB/Mn. The canted antiferromagnetic insulating phase in ultra thin films of n<10 coincides with the occurrence of a higher symmetry structural phase with a different oxygen octahedra rotation pattern. Such a strain engineered phase is an interesting candidate for an insulating tunneling barrier in room temperature spin polarized tunneling devices.
Item Type:Article
Copyright:© 2012 American Physical Society
Link to this item:http://purl.utwente.nl/publications/81925
Official URL:http://dx.doi.org/10.1103/PhysRevLett.109.157207
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