Torque magnetometry of an amorphous-alumina/strontium-titanate interface

Tomarken, S. L.; Young, A. F.; Lee, S. W.; Gordon, R. G.; Ashoori, R. C.

doi:10.1103/physrevb.90.201113

Title: Torque magnetometry of an amorphous-alumina/strontium-titanate interface

Journal Article · Sat Nov 01 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.90.201113· OSTI ID:1505752

Tomarken, S. L. ^[1]; Young, A. F. ^[1]; Lee, S. W. ^[2]; Gordon, R. G. ^[2]; Ashoori, R. C. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology

Here, we report torque magnetometry measurements of an oxide heterostructure consisting of an amorphous Al₂O₃ thin film grown on a crystalline SrTiO₃ substrate (α -AO/STO) by atomic layer deposition. We find a torque response that resembles previous studies of crystalline LaAlO₃/SrTiO₃ (LAO/STO) heterointerfaces, consistent with strongly anisotropic magnetic ordering in the plane of the interface. Unlike crystalline LAO, amorphous Al₂O₃ 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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF)

Grant/Contract Number:: FG02-08ER46514; GBMF2931; 1122374

OSTI ID:: 1505752

Alternate ID(s):: OSTI ID: 1181027

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 20; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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