Spin-dependent tunneling spectroscopy for interface characterization of epitaxial Fe/MgO/Fe magnetic tunnel junctions

G. X. Du; S. G. Wang; Q. L. Ma; Yan Wang; R. C.C. Ward; X. G. Zhang; C. Wang; A. Kohn; X. F. Han

doi:10.1103/PhysRevB.81.064438

Spin-dependent tunneling spectroscopy for interface characterization of epitaxial Fe/MgO/Fe magnetic tunnel junctions

G. X. Du, S. G. Wang, Q. L. Ma, Yan Wang, R. C.C. Ward, X. G. Zhang, C. Wang, A. Kohn, X. F. Han

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

39 Scopus citations

Abstract

Low-voltage spin-dependent tunneling spectroscopy of an epitaxial Fe/MgO/Fe magnetic tunnel junction is measured and compared to first-principles calculation of the tunneling conductance. The measured dynamic conductance (dI/dV) in the parallel configuration shows distinct asymmetric features as a function of the bias voltage. The peaks are independent of barrier thickness, magnetic field, and temperature. With the help of the first-principles calculations, positive and negative bias spectra can be related to different types of Fe/MgO interfaces.

Original language	English
Article number	064438
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.81.064438
State	Published - 26 Feb 2010
Externally published	Yes

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abstract = "Low-voltage spin-dependent tunneling spectroscopy of an epitaxial Fe/MgO/Fe magnetic tunnel junction is measured and compared to first-principles calculation of the tunneling conductance. The measured dynamic conductance (dI/dV) in the parallel configuration shows distinct asymmetric features as a function of the bias voltage. The peaks are independent of barrier thickness, magnetic field, and temperature. With the help of the first-principles calculations, positive and negative bias spectra can be related to different types of Fe/MgO interfaces.",

author = "Du, {G. X.} and Wang, {S. G.} and Ma, {Q. L.} and Yan Wang and Ward, {R. C.C.} and Zhang, {X. G.} and C. Wang and A. Kohn and Han, {X. F.}",

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AU - Du, G. X.

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AU - Ma, Q. L.

AU - Wang, Yan

AU - Ward, R. C.C.

AU - Zhang, X. G.

AU - Wang, C.

AU - Kohn, A.

AU - Han, X. F.

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AB - Low-voltage spin-dependent tunneling spectroscopy of an epitaxial Fe/MgO/Fe magnetic tunnel junction is measured and compared to first-principles calculation of the tunneling conductance. The measured dynamic conductance (dI/dV) in the parallel configuration shows distinct asymmetric features as a function of the bias voltage. The peaks are independent of barrier thickness, magnetic field, and temperature. With the help of the first-principles calculations, positive and negative bias spectra can be related to different types of Fe/MgO interfaces.

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Spin-dependent tunneling spectroscopy for interface characterization of epitaxial Fe/MgO/Fe magnetic tunnel junctions

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