Magnetotransport in manganite trilayer junctions grown by 90° off-axis sputtering

Noh, J. S.; Nath, T. K.; Eom, C. B.; Sun, J. Z.; Tian, W.; Pan, X. Q.
July 2001
Applied Physics Letters;7/9/2001, Vol. 79 Issue 2
Academic Journal
We report magnetotransport studies on La[sub 0.67]Sr[sub 0.33]MnO[sub 3]/SrTiO[sub 3]/La[sub 0.67]Sr[sub 0.33]MnO[sub 3] trilayer junctions, fabricated using 90° off-axis sputtering. Films were grown on both (001) (LaAlO[sub 3])[sub 0.3]–(Sr[sub 2]AlTaO[sub 6])[sub 0.7] and (110) NdGaO[sub 3] 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) (LaAlO[sub 3])[sub 0.3]–(Sr[sub 2]AlTaO[sub 6])[sub 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.


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