| 2507 |
Creator |
18ae2b8a4c0f80e673c4f652fc5798b0 |
| 2507 |
Creator |
ext-cb4e5724d161daf1ab1d18567e940e34 |
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Date |
2005-06-03 |
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Is Part Of |
p10980121 |
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Is Part Of |
repository |
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abstract |
Calculation of the magnetoresistance of an epitaxial Fe/Au/MgO/Au/Fe(001) tunneling
junction is reported. The tunneling magnetoresistance (TMR) is determined without
any approximations from the real-space Kubo formula using tight-binding bands fitted
to an ab initio band structure of Fe, Au, and MgO. A very high TMR ratio of 1000%
is predicted for a junction with seven to nine atomic planes of MgO sandwiched between
two Au layers, each consisting of eight atomic planes. The insertion of two Au interlayers
should prevent oxidation of the Fe electrodes, which is detrimental to TMR in the
junction without Au interlayers. It is also found that the TMR oscillates as a function
of Au thickness with a period determined by the spanning vector of the Au Fermi surface
belly. The underlying physics is explained in terms of a simple parabolic band model
of resonant tunneling for a barrier sandwiched between two quantum wells. |
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authorList |
authors |
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issue |
22 |
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status |
peerReviewed |
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volume |
71 |
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type |
AcademicArticle |
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type |
Article |
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label |
Mathon, J. and Umerski, A. (2005). Theory of resonant tunneling in an epitaxial
Fe/Au/MgO/Au/Fe(001) junction. Physical Review B, 71(22) pp. 2204021–2204024.
|
| 2507 |
label |
Mathon, J. and Umerski, A. (2005). Theory of resonant tunneling in an epitaxial
Fe/Au/MgO/Au/Fe(001) junction. Physical Review B, 71(22) pp. 2204021–2204024. |
| 2507 |
Title |
Theory of resonant tunneling in an epitaxial Fe/Au/MgO/Au/Fe(001) junction |
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in dataset |
oro |