Improved tunneling magnetoresistance at low temperature in manganite junctions grown by molecular beam epitaxy

Journal Article · Mon Apr 18 04:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3581885· OSTI ID:21518399

Werner, R; Kleiner, R; Koelle, D ^[1]; Petrov, A Yu; Davidson, B A ^[2]; Mino, L Alvarez ^[3]

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1. Physikalisches Institut-Experimentalphysik II, Universitaet Tuebingen, Auf der Morgenstelle 14, 72076 Tuebingen (Germany)
2. TASC National Laboratory, CNR-IOM, S.S. 14 Km 163.5 in AREA Science Park, 34012 Basovizza, Trieste (Italy)
3. Universidad Nacional de Colombia, Sede Manizales, Cra 27 64-60 Manizales (Colombia)

We report resistance versus magnetic field measurements for a La{sub 0.65}Sr{sub 0.35}MnO{sub 3}/SrTiO{sub 3}/La{sub 0.65}Sr{sub 0.35}MnO{sub 3} tunnel junction grown by molecular-beam epitaxy, that show a large field window of extremely high tunneling magnetoresistance (TMR) at low temperature. Scanning the in-plane applied field orientation through 360 deg., the TMR shows fourfold symmetry, i.e., biaxial anisotropy, aligned with the crystalline axis but not the junction geometrical long axis. The TMR reaches {approx}1900% at 4 K, corresponding to an interfacial spin polarization of >95% assuming identical interfaces. These results show that uniaxial anisotropy is not necessary for large TMR, and lay the groundwork for future improvements in TMR in manganite junctions.

• OSTI ID: 21518399
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 98; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
ANISOTROPY
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EPITAXY
HETEROJUNCTIONS
INTERFACES
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MAGNETORESISTANCE
MANGANATES
MANGANESE COMPOUNDS
MOLECULAR BEAM EPITAXY
ORIENTATION
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SEMICONDUCTOR JUNCTIONS
SPIN
SPIN ORIENTATION
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
SUPERCONDUCTING JUNCTIONS
SYMMETRY
TEMPERATURE DEPENDENCE
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT