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

Robert Werner; Alexandr Yu. Petrov; Lucero Alvarez Mino; Reinhold Kleiner; Dieter Koelle; Bruce A. Davidson

doi:10.1063/1.3581885

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

Mesoscale and Nanoscale Physics 2015-05-27 v1 Materials Science

Authors: Robert Werner , Alexandr Yu. Petrov , Lucero Alvarez Mino , Reinhold Kleiner , Dieter Koelle , Bruce A. Davidson

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Abstract

We report resistance versus magnetic field measurements for a La0.65Sr0.35MnO3/SrTiO3/La0.65Sr0.35MnO3 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^/circ, the TMR shows 4-fold symmetry, i.e. biaxial anisotropy, aligned with the crystalline axes but not the junction geometrical long axis. The TMR reaches ~ 1900% at 4K, 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.

Keywords

tunneling magnetoresistance manganite tunnel junctions molecular beam epitaxy biaxial anisotropy interfacial spin polarization low temperature

Cite

@article{arxiv.1104.1072,
  title  = {Improved tunneling magnetoresistance at low temperature in manganite junctions grown by molecular beam epitaxy},
  author = {Robert Werner and Alexandr Yu. Petrov and Lucero Alvarez Mino and Reinhold Kleiner and Dieter Koelle and Bruce A. Davidson},
  journal= {arXiv preprint arXiv:1104.1072},
  year   = {2015}
}

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6 pages, 7 figures; accepted in Applied Physics Letters

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

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