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

Abstract

We present a study of the thickness dependence of magnetism and electrical conductivity in ultra thin 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 (TC) increased, indicating a magnetic insulating phase at room temperature. These samples have a TC of about 560 K with a significant saturation magnetization of 1.2 +- 0.2 muB/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.

arXiv commentPhys. Rev. Lett. 109, 157207 (2012)

References in corpus (11)

• Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments
• Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films
• Structure and properties of functional oxide thin films: Insights from electronic-structure calculations
• Misfit Strain Accommodation in Epitaxial ABO3 Perovskites: Lattice Rotations and Lattice Modulations
• Interface ferromagnetism and orbital reconstruction in BiFeO3- La0.7Sr0.3MnO3 heterostructures
• Suppression of Octahedral Tilts and Associated Changes of Electronic Properties at Epitaxial Oxide Heterostructure Interfaces
• Quantifying octahedral rotations in strained perovskite oxide films
• Spin filtering through ferromagnetic BiMnO3 tunnel barriers
• Optimized fabrication of high quality La0.67Sr0.33MnO3 thin films considering all essential characteristics
• Substrate coherency-driven octahedral rotations in perovskite oxide films
• Large increase of the Curie temperature by orbital ordering control

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• Electronic structure and magnetic and optical properties of double perovskite Bi2FeCrO6 from first-principles investigation
• Magnetic Dead Layers in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ Revisited
• Raman spectra and Magnetization of all-ferromagnetic superlattices grown on (110) oriented SrTiO3
• Promising ferrimagnetic double perovskite oxides towards high spin polarization at high temperature
• Insulating-to-Conducting Behavior and Band Profile Across the La0.9Ba0.1MnO3/Nb:SrTiO3 Epitaxial Interface
• Robust ferromagnetism in insulating La${}_2$NiMnO${}_6$ thin films
• Weakly damped acoustic plasmon mode in transition metal dichalcogenides with Zeeman splitting
• A Real Space Description of Magnetic Field Induced Melting in the Charge Ordered Manganites: I. The Clean Limit