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The development of organic spin valves from unipolar to bipolar operation

Published online by Cambridge University Press:  15 July 2014

Tho D. Nguyen ,
Eitan Ehrenfreund  and
Z. Valy Vardeny
Tho D. Nguyen
Affiliation:
Physics and Astronomy Department, University of Georgia, USA; [email protected]
Eitan Ehrenfreund
Affiliation:
Technion-Israel Institute of Technology and University of Utah, USA; [email protected]
Z. Valy Vardeny
Affiliation:
Physics and Astronomy Department, University of Utah, USA; [email protected]
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Abstract

We review the first 10 years of research on organic spin-valve devices in the field of organic spintronics. The device figure of merit, magnetoresistance, is governed by the hyperfine interaction of the organic interlayer and the ability of the ferromagnetic electrodes to inject spin-polarized carriers. By choosing a deuterated π-conjugated polymer with a relatively long spin diffusion length as the organic interlayer and using a thin LiF buffer layer to raise the Fermi level of the cathode, a bipolar spin-valve device could be obtained in which the electroluminescence emission intensity is controlled by an external magnetic field. We show that the underlying physics of this spin-organic light-emitting diode is very different from that of a unipolar organic spin valve because of the magnetic properties of the spin-polarized bipolar space charge limited current in the device.

Keywords

organicspintronicmagnetoresistance (transport)
Type
Research Article
Information
MRS Bulletin , Volume 39 , Issue 7: Organic Spintronics , July 2014 , pp. 585 - 589
Copyright
Copyright © Materials Research Society 2014 

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