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

Hans Boschker, Jaap Kautz, Evert P. Houwman, Wolter Siemons, David H.A. Blank, Mark Huijben, Gertjan Koster, Arturas Vailionis, Guus Rijnders

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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.
Original languageEnglish
Article number157207
Number of pages5
JournalPhysical review letters
Volume109
Issue number15
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-288570
  • IR-81925

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