Transport in ferromagnetic GdTiO3 / SrTiO3 heterostructures

Pouya Moetakef; Jack Y. Zhang; Alexander Kozhanov; Bharat Jalan; Ram Seshadri; S. James Allen; Susanne Stemmer

doi:10.1063/1.3568894

Transport in ferromagnetic GdTiO₃ / SrTiO₃ heterostructures

Pouya Moetakef, Jack Y. Zhang, Alexander Kozhanov, Bharat Jalan, Ram Seshadri, S. James Allen, Susanne Stemmer

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

Epitaxial GdTiO₃ / SrTiO₃ structures with different SrTiO₃ layer thicknesses are grown on (001) (LaAlO₃) 0.3 (Sr₂ AlTaO₆) _0.7 substrate surfaces by hybrid molecular beam epitaxy. It is shown that the formation of the pyrochlore (Gd₂ Ti₂ O₇) phase can be avoided if GdTiO ₃ is grown by shuttered growth, supplying alternating monolayer doses of Gd and of the metalorganic precursor that supplies both Ti and O. Phase-pure GdTiO₃ films grown by this approach exhibit magnetic ordering with a Curie temperature of 30 K. The electrical transport characteristics can be understood as being dominated by a conductive interface layer within the SrTiO₃.

Original language	English (US)
Article number	112110
Journal	Applied Physics Letters
Volume	98
Issue number	11
DOIs	https://doi.org/10.1063/1.3568894
State	Published - Mar 14 2011

Bibliographical note

Funding Information:
P.M. and J.Y.Z. were supported through awards from the U.S. National Science Foundation (Grant No. DMR-1006640) and DOE Basic Energy Sciences (Grant No. DE-FG02-02ER45994). S.S. and S.J.A. acknowledge support through a MURI program of the Army Research Office (Grant No. W911-NF-09-1-0398). B.J. is supported by the MRSEC Program of the National Science Foundation (Award No. DMR 05-20415). The work made use of the UCSB Nanofabrication Facility, a part of the NSF-funded NNIN network.

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title = "Transport in ferromagnetic GdTiO3 / SrTiO3 heterostructures",

abstract = "Epitaxial GdTiO3 / SrTiO3 structures with different SrTiO3 layer thicknesses are grown on (001) (LaAlO3) 0.3 (Sr2 AlTaO6) 0.7 substrate surfaces by hybrid molecular beam epitaxy. It is shown that the formation of the pyrochlore (Gd2 Ti2 O7) phase can be avoided if GdTiO 3 is grown by shuttered growth, supplying alternating monolayer doses of Gd and of the metalorganic precursor that supplies both Ti and O. Phase-pure GdTiO3 films grown by this approach exhibit magnetic ordering with a Curie temperature of 30 K. The electrical transport characteristics can be understood as being dominated by a conductive interface layer within the SrTiO3.",

author = "Pouya Moetakef and Zhang, {Jack Y.} and Alexander Kozhanov and Bharat Jalan and Ram Seshadri and Allen, {S. James} and Susanne Stemmer",

note = "Funding Information: P.M. and J.Y.Z. were supported through awards from the U.S. National Science Foundation (Grant No. DMR-1006640) and DOE Basic Energy Sciences (Grant No. DE-FG02-02ER45994). S.S. and S.J.A. acknowledge support through a MURI program of the Army Research Office (Grant No. W911-NF-09-1-0398). B.J. is supported by the MRSEC Program of the National Science Foundation (Award No. DMR 05-20415). The work made use of the UCSB Nanofabrication Facility, a part of the NSF-funded NNIN network. ",

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AU - Moetakef, Pouya

AU - Zhang, Jack Y.

AU - Kozhanov, Alexander

AU - Jalan, Bharat

AU - Seshadri, Ram

AU - Allen, S. James

AU - Stemmer, Susanne

N1 - Funding Information: P.M. and J.Y.Z. were supported through awards from the U.S. National Science Foundation (Grant No. DMR-1006640) and DOE Basic Energy Sciences (Grant No. DE-FG02-02ER45994). S.S. and S.J.A. acknowledge support through a MURI program of the Army Research Office (Grant No. W911-NF-09-1-0398). B.J. is supported by the MRSEC Program of the National Science Foundation (Award No. DMR 05-20415). The work made use of the UCSB Nanofabrication Facility, a part of the NSF-funded NNIN network.

PY - 2011/3/14

Y1 - 2011/3/14

N2 - Epitaxial GdTiO3 / SrTiO3 structures with different SrTiO3 layer thicknesses are grown on (001) (LaAlO3) 0.3 (Sr2 AlTaO6) 0.7 substrate surfaces by hybrid molecular beam epitaxy. It is shown that the formation of the pyrochlore (Gd2 Ti2 O7) phase can be avoided if GdTiO 3 is grown by shuttered growth, supplying alternating monolayer doses of Gd and of the metalorganic precursor that supplies both Ti and O. Phase-pure GdTiO3 films grown by this approach exhibit magnetic ordering with a Curie temperature of 30 K. The electrical transport characteristics can be understood as being dominated by a conductive interface layer within the SrTiO3.

AB - Epitaxial GdTiO3 / SrTiO3 structures with different SrTiO3 layer thicknesses are grown on (001) (LaAlO3) 0.3 (Sr2 AlTaO6) 0.7 substrate surfaces by hybrid molecular beam epitaxy. It is shown that the formation of the pyrochlore (Gd2 Ti2 O7) phase can be avoided if GdTiO 3 is grown by shuttered growth, supplying alternating monolayer doses of Gd and of the metalorganic precursor that supplies both Ti and O. Phase-pure GdTiO3 films grown by this approach exhibit magnetic ordering with a Curie temperature of 30 K. The electrical transport characteristics can be understood as being dominated by a conductive interface layer within the SrTiO3.

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