LaAlO3 thickness window for electronically controlled magnetism at LaAlO3/SrTiO3 heterointerfaces. Bi, F., Huang, M., Lee, H., Eom, C., Irvin, P., & Levy, J. APPLIED PHYSICS LETTERS, AUG 24, 2015. doi abstract bibtex Complex-oxide heterostructures exhibit rich physical behavior such as emergent conductivity, superconductivity, and magnetism that are intriguing for scientific reasons as well as for potential technological applications. It was recently discovered that in-plane magnetism at the LaAlO3/SrTiO3 (LAO/STO) interface can be electronically controlled at room temperature. Here, we employ magnetic force microscopy to investigate electronically controlled ferromagnetism at the LAO/STO interface with LAO thickness t varied from 4 unit cell (u.c.) to 40 u.c. Magnetic signatures are observed only within a thickness window 8 u.c. <= t <= 25 u.c. Within this window, the device capacitance corresponds well to the expected geometric value, while for thicknesses outside this window, the capacitance is strongly suppressed. The ability to modulate electronic and magnetic properties of LAO/STO devices depends on the ability to control carrier density, which is in turn constrained by intrinsic tunneling mechanisms. (C) 2015 AIP Publishing LLC.
@article{ ISI:000360593900042,
Author = {Bi, Feng and Huang, Mengchen and Lee, Hyungwoo and Eom, Chang-Beom and
Irvin, Patrick and Levy, Jeremy},
Title = {{LaAlO3 thickness window for electronically controlled magnetism at
LaAlO3/SrTiO3 heterointerfaces}},
Journal = {{APPLIED PHYSICS LETTERS}},
Year = {{2015}},
Volume = {{107}},
Number = {{8}},
Month = {{AUG 24}},
Abstract = {{Complex-oxide heterostructures exhibit rich physical behavior such as
emergent conductivity, superconductivity, and magnetism that are
intriguing for scientific reasons as well as for potential technological
applications. It was recently discovered that in-plane magnetism at the
LaAlO3/SrTiO3 (LAO/STO) interface can be electronically controlled at
room temperature. Here, we employ magnetic force microscopy to
investigate electronically controlled ferromagnetism at the LAO/STO
interface with LAO thickness t varied from 4 unit cell (u.c.) to 40 u.c.
Magnetic signatures are observed only within a thickness window 8 u.c.
<= t <= 25 u.c. Within this window, the device capacitance corresponds
well to the expected geometric value, while for thicknesses outside this
window, the capacitance is strongly suppressed. The ability to modulate
electronic and magnetic properties of LAO/STO devices depends on the
ability to control carrier density, which is in turn constrained by
intrinsic tunneling mechanisms. (C) 2015 AIP Publishing LLC.}},
DOI = {{10.1063/1.4929430}},
Article-Number = {{082402}},
ISSN = {{0003-6951}},
EISSN = {{1077-3118}},
ResearcherID-Numbers = {{Eom, Chang-Beom/I-5567-2014
Irvin, Patrick/E-2159-2012
Lee, Hyungwoo/H-9347-2018}},
ORCID-Numbers = {{Irvin, Patrick/0000-0002-0248-2758
}},
Unique-ID = {{ISI:000360593900042}},
}
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