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

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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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Metis ID: 288570