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Lecture Bert Koopmans


03 October 2011 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Prof. Dr. Bert Koopmans
Affiliation: Center of NanoMaterials (cNM), TU Eindhoven
Title: Spin in organics, a new route to spintronics
Date: Mon Oct 3, 2011
Start: 16.00
Location: FWN-Building 5114.0004
Host: C.H. van der Wal
Telephone: +31 50 363 4974


Organic spintronics aims at new device functionality by combining the field of magneto- or spinelectronics with that of organic or plastic electronics. In hybrid organic spin-valves, an organic semiconducting film is sandwiched between two ferromagnetic thin films, giving magnetoresistive effects that exploit the long spin relaxation time in organics. Alternatively, organic magnetoresistance (OMAR) has been observed in devices without any ferromagnetic components, displaying up to 30% at room temperature, and only small magnetic fields of a few mT. This presentation introduces this novel OMAR effect, and shows that it provides us with entirely new physics, combining `spin blocking' mechanisms with specific features of the behaviour of devices operating in bipolar space-charge limited current regime. It will be shown that weak hyperfine fields from the hydrogen atoms are crucial for a proper understanding of both OMAR and organic spin valves.

Last modified:22 October 2012 2.30 p.m.