Spin-dependent tunneling through high-k LaAlO3

V. Garcia; M. Bibes; J. L. Maurice; E. Jacquet; K. Bouzehouane; J. P. Contour; A. Barthélémy

doi:10.1063/1.2132526

Spin-dependent tunneling through high-k LaAlO₃

V. Garcia
, M. Bibes
, J. L. Maurice
, E. Jacquet
, K. Bouzehouane
, J. P. Contour
, A. Barthélémy

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

Abstract

We report on the use of the LaAlO3 (LAO) high- k dielectric as a tunnel barrier in magnetic tunnel junctions. From tunnel magnetoresistance (TMR) measurements on epitaxial La23 Sr13 MnO3 LAO La23 Sr13 MnO3 junctions, we estimate a spin polarization of 77% at low temperature for the La23 Sr13 MnO3 LAO interface. Remarkably, the TMR of La23 Sr13 MnO3 LAOCo junctions at low bias is negative, evidencing a negative spin polarization of Co at the interface with LAO, and its bias dependence is very similar to that of La23 Sr13 MnO3 SrTiO3 Co junctions. We discuss possible reasons for this behavior.

Original language	English
Article number	212501
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	87
Issue number	21
DOIs	https://doi.org/10.1063/1.2132526
Publication status	Published - 1 Jan 2005

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10.1063/1.2132526

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title = "Spin-dependent tunneling through high-k LaAlO3 ",

abstract = "We report on the use of the LaAlO3 (LAO) high- k dielectric as a tunnel barrier in magnetic tunnel junctions. From tunnel magnetoresistance (TMR) measurements on epitaxial La23 Sr13 MnO3 LAO La23 Sr13 MnO3 junctions, we estimate a spin polarization of 77\% at low temperature for the La23 Sr13 MnO3 LAO interface. Remarkably, the TMR of La23 Sr13 MnO3 LAOCo junctions at low bias is negative, evidencing a negative spin polarization of Co at the interface with LAO, and its bias dependence is very similar to that of La23 Sr13 MnO3 SrTiO3 Co junctions. We discuss possible reasons for this behavior.",

author = "V. Garcia and M. Bibes and Maurice, \{J. L.\} and E. Jacquet and K. Bouzehouane and Contour, \{J. P.\} and A. Barth{\'e}l{\'e}my",

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doi = "10.1063/1.2132526",

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TY - JOUR

T1 - Spin-dependent tunneling through high-k LaAlO3

AU - Garcia, V.

AU - Bibes, M.

AU - Maurice, J. L.

AU - Jacquet, E.

AU - Bouzehouane, K.

AU - Contour, J. P.

AU - Barthélémy, A.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - We report on the use of the LaAlO3 (LAO) high- k dielectric as a tunnel barrier in magnetic tunnel junctions. From tunnel magnetoresistance (TMR) measurements on epitaxial La23 Sr13 MnO3 LAO La23 Sr13 MnO3 junctions, we estimate a spin polarization of 77% at low temperature for the La23 Sr13 MnO3 LAO interface. Remarkably, the TMR of La23 Sr13 MnO3 LAOCo junctions at low bias is negative, evidencing a negative spin polarization of Co at the interface with LAO, and its bias dependence is very similar to that of La23 Sr13 MnO3 SrTiO3 Co junctions. We discuss possible reasons for this behavior.

AB - We report on the use of the LaAlO3 (LAO) high- k dielectric as a tunnel barrier in magnetic tunnel junctions. From tunnel magnetoresistance (TMR) measurements on epitaxial La23 Sr13 MnO3 LAO La23 Sr13 MnO3 junctions, we estimate a spin polarization of 77% at low temperature for the La23 Sr13 MnO3 LAO interface. Remarkably, the TMR of La23 Sr13 MnO3 LAOCo junctions at low bias is negative, evidencing a negative spin polarization of Co at the interface with LAO, and its bias dependence is very similar to that of La23 Sr13 MnO3 SrTiO3 Co junctions. We discuss possible reasons for this behavior.

UR - https://www.scopus.com/pages/publications/27844476963

U2 - 10.1063/1.2132526

DO - 10.1063/1.2132526

M3 - Article

AN - SCOPUS:27844476963

SN - 0003-6951

VL - 87

SP - 1

EP - 3

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 21

M1 - 212501

ER -

Spin-dependent tunneling through high-k LaAlO₃

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