Large magnetoresistance at room-temperature in semiconducting polymer sandwich devices

Details Large magnetoresistance at room-temperature in semiconducting polymer sandwich devices Large magnetoresistance at room-temperature in semiconducting polymer sandwich devices

2004-09-29

arxiv.org/abs/cond-mat/0409753v1

Physics

Condensed Matter

Materials Science

3 pages, 4 figures

Scientific paper

10.1088/1367-2630/6/1/185

We report on the discovery of a large, room temperature magnetoresistance (MR) effect in polyfluorene sandwich devices in weak magnetic fields. We characterize this effect and discuss its dependence on voltage, temperature, film thickness, electrode materials, and (unintentional) impurity concentration. We usually observed negative MR, but positive MR can also be achieved under high applied electric fields. The MR effect reaches up to 10% at fields of 10mT at room temperature. The effect shows only a weak temperature dependence and is independent of the sign and direction of the magnetic field. We find that the effect is related to the hole current in the devices.

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