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Magnetotransport in Epitaxial Trilayer Junctions Fabricated from 90° Off-Axis Sputtered Manganite Films

Published online by Cambridge University Press:  10 February 2011

J. S. Noh ,
T. K. Nath ,
J. Z. Sun  and
C. B. Eom
J. S. Noh
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708
T. K. Nath
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708
J. Z. Sun
Affiliation:
IBM T.J. Watson Research Center, PO Box 218, Yorktown Heights, NY 10598
C. B. Eom
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708
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Abstract

We report studies on La1−xSrxMnO3 /SrTiO3/ La1−xSrxMnO3 (x=0.33) trilayer junctions made using 90° off-axis sputtering. Both (110) NdGaO3 and (001) (LaAlO3)0.3-(Sr2AlTaO6)0.7 (LSAT) are used for substrates. Optical lithography is used for junction formation. These sputtered trilayers show improved junction resistance uniformity over trilayers made using laser ablation. A magnetoresistance of ∼100% is observed for junctions on LSAT with 30 Å barrier at 13 K and around 100 Oe. The shape of junction magnetoresistance vs. field depends both on barrier thickness and on substrate type, suggesting that both inter-layer coupling and substrateinduced-strain play a role in determining the junction's micromagnetic state. These results indicate better junction interfaces can be obtained for manganite trilayer junctions by 90° off-axis sputtering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 99
Copyright
Copyright © Materials Research Society 2000

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