Magnetotransport in manganite trilayer junctions grown by 90° off-axis sputtering
نویسندگان
چکیده
We report magnetotransport studies on La0.67Sr0.33MnO3 /SrTiO3 /La0.67Sr0.33MnO3 trilayer junctions, fabricated using 90° off-axis sputtering. Films were grown on both ~001! ~LaAlO3!0.3–~Sr2AlTaO6!0.7 and ~110! NdGaO3 substrates. The sputtered trilayers show improved junction resistance uniformity over those made using pulsed laser deposition. Cross-sectional transmission electron microscopy and atomic force microscopy studies confirm smooth interfaces and a uniform barrier. Magnetoresistances up to ;100% are observed for junctions on ~001! ~LaAlO3!0.3–~Sr2AlTaO6!0.7 with a 30 Å barrier at 13 K and around 100 Oe. Junction magnetoresistance versus magnetic field behavior is more stable, indicating improved transport and magnetic homogeneity across the junction. © 2001 American Institute of Physics. @DOI: 10.1063/1.1383276#
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