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Spin Diode Based on Fe/MgO Double Tunnel Junction

We demonstrate a spin diode consisting of a semiconductor free nano-scale Fe/MgO-based double tunnel junction. The device exhibits a near perfect spin-valve effect combined with a strong diode effect. The mechanism consistent with our data is resonant tunneling through discrete states in the middle ferromagnetic layer sandwiched by tunnel barriers of different spin-dependent transparency. The observed magneto-resistance is record high, ~4000%, essentially making the structure an on/off spin-switch. This, combined with the strong diode effect, ~100, offers a new device that should be promising for such technologies as magnetic random access memory and re-programmable logic.

preprint2007arXivOpen access
A. IovanS. AnderssonYu. G. NaidyukA. VedyaevB. DienyV. Korenivski
cond-mat.mes-hall
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Open access6 authors1 topic
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A. IovanS. AnderssonYu. G. NaidyukA. VedyaevB. DienyV. Korenivski

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