Torque magnetometry of an amorphous-alumina/strontium-titanate interface
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PhysRevB.90.201113.pdf
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Author(s)
Lee, S. W.
Gordon, Roy G.
Tomarken, Spencer Louis
Young, Andrea Franchini
Ashoori, Raymond
Date Issued
November 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Tomarken, S. L., A. F. Young, S. W. Lee, R. G. Gordon, and R. C. Ashoori. "Torque magnetometry of an amorphous-alumina/strontium-titanate interface." Phys. Rev. B 90, 201113 (November 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We report torque magnetometry measurements of an oxide heterostructure consisting of an amorphous Al[subscript 2]O[subscript 3] thin film grown on a crystalline SrTiO[subscript 3] substrate (a-AO/STO) by atomic layer deposition. We find a torque response that resembles previous studies of crystalline LaAlO[subscript 3]/SrTiO[subscript 3] (LAO/STO) heterointerfaces, consistent with strongly anisotropic magnetic ordering in the plane of the interface. Unlike crystalline LAO, amorphous Al[subscript 2]O[subscript 3] is nonpolar, indicating that planar magnetism at an oxide interface is possible without the strong internal electric fields generated within the polarization catastrophe model. We discuss our results in the context of current theoretical efforts to explain magnetism in crystalline LAO/STO.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.90.201113
