Space-charge trap mediated conductance blockade in tunnel junctions with half-metallic electrodes

J. F. Feng; T. H. Kim; X. F. Han; X. G. Zhang; Y. Wang; J. Zou; D. B. Yu; H. Yan; A. P. Li

doi:10.1063/1.3025851

Space-charge trap mediated conductance blockade in tunnel junctions with half-metallic electrodes

J. F. Feng, T. H. Kim, X. F. Han, X. G. Zhang, Y. Wang, J. Zou, D. B. Yu, H. Yan, A. P. Li

Scanning Tunneling Microscopy Group

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

A conductance blockade effect has been observed in the magnetic tunnel junction consisting of La_0.7Sr_0.3MnO₃ electrodes and a SrTiO₃ barrier. The blockade effect is correlated with the space-charge trap states in the barrier. The blockade threshold eV _B =128 meV is significantly greater than Coulomb charging energy E_C =11 meV. The blockade can be lifted with a magnetic field, accompanied by a very large magnetoresistance up to 10 000%. The intriging blockade behavior is distinctly different from the conventional Coulomb blockade effect, showing a unique spin-dependent tunneling process mediated by the localized charge trap states.

Original language	English
Article number	192507
Journal	Applied Physics Letters
Volume	93
Issue number	19
DOIs	https://doi.org/10.1063/1.3025851
State	Published - 2008

Funding

T.-H.K., X.-G.Z., and A.P.L. acknowledge the support from the Center for Nanophase Materials Sciences, which is sponsored at the Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy. X.F.H. thanks the partial support of the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST, Grant No. 2006CB932200), and the Chinese National Natural Science Foundation (NSFC, Grant Nos. 10574156, 50528101, and 50721001).

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title = "Space-charge trap mediated conductance blockade in tunnel junctions with half-metallic electrodes",

abstract = "A conductance blockade effect has been observed in the magnetic tunnel junction consisting of La0.7Sr0.3MnO3 electrodes and a SrTiO3 barrier. The blockade effect is correlated with the space-charge trap states in the barrier. The blockade threshold eV B =128 meV is significantly greater than Coulomb charging energy EC =11 meV. The blockade can be lifted with a magnetic field, accompanied by a very large magnetoresistance up to 10 000%. The intriging blockade behavior is distinctly different from the conventional Coulomb blockade effect, showing a unique spin-dependent tunneling process mediated by the localized charge trap states.",

author = "Feng, {J. F.} and Kim, {T. H.} and Han, {X. F.} and Zhang, {X. G.} and Y. Wang and J. Zou and Yu, {D. B.} and H. Yan and Li, {A. P.}",

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T1 - Space-charge trap mediated conductance blockade in tunnel junctions with half-metallic electrodes

AU - Feng, J. F.

AU - Kim, T. H.

AU - Han, X. F.

AU - Zhang, X. G.

AU - Wang, Y.

AU - Zou, J.

AU - Yu, D. B.

AU - Yan, H.

AU - Li, A. P.

PY - 2008

Y1 - 2008

N2 - A conductance blockade effect has been observed in the magnetic tunnel junction consisting of La0.7Sr0.3MnO3 electrodes and a SrTiO3 barrier. The blockade effect is correlated with the space-charge trap states in the barrier. The blockade threshold eV B =128 meV is significantly greater than Coulomb charging energy EC =11 meV. The blockade can be lifted with a magnetic field, accompanied by a very large magnetoresistance up to 10 000%. The intriging blockade behavior is distinctly different from the conventional Coulomb blockade effect, showing a unique spin-dependent tunneling process mediated by the localized charge trap states.

AB - A conductance blockade effect has been observed in the magnetic tunnel junction consisting of La0.7Sr0.3MnO3 electrodes and a SrTiO3 barrier. The blockade effect is correlated with the space-charge trap states in the barrier. The blockade threshold eV B =128 meV is significantly greater than Coulomb charging energy EC =11 meV. The blockade can be lifted with a magnetic field, accompanied by a very large magnetoresistance up to 10 000%. The intriging blockade behavior is distinctly different from the conventional Coulomb blockade effect, showing a unique spin-dependent tunneling process mediated by the localized charge trap states.

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DO - 10.1063/1.3025851

M3 - Article

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SN - 0003-6951

VL - 93

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 19

M1 - 192507

ER -

Space-charge trap mediated conductance blockade in tunnel junctions with half-metallic electrodes

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