New Directions for Organic Spintronics

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• Professor Ezekiel Johnston-Halperin
• Friday 12 February 2016, 14:00-15:00
• MRC Building Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Stuart Higgins.

The study of magnetism dates back to at least the 6th century BCE with the discovery of lodestone in Ancient Greece and its immediate implementation as a primitive navigational aid. This genesis sets the tone for over 2,500 years of practical applications that significantly lead fundamental understanding of the underlying principles. Even today, our ability to predict magnetic interactions in new materials substantially lags our ability to predict other materials properties while magnetic phenomena form the foundation of applications ranging from automotive engineering to information technology. This tension creates an exciting and somewhat unusual opportunity for fundamental research, where advances in understanding have the potential to both open up new directions at the frontiers of science and reflect back through well established technologies.

Here, I will present work that exploits this potential through the development of organic-based magnetic materials based on vanadium tetracyanoethelyne (V[TCNE]2) and its derivatives. The magnetic ordering in V[TCNE]2 is surprisingly robust and complex, with a Curie temperature of over 600 K and a low temperature transition to a spin-glass like state known as a sperrimagnet at 150 K. Leveraging this magnetic functionality we have demonstrated DC spintronic functionality in hybrid V[TCNE]2/III-V semiconductor heterostructures, and inspired by the development of ferromagnetic resonance (FMR) driven spin pumping in both inorganic and non-magnetic organic materials, we have recently begun exploring the extension of this spin functionality into the microwave regime. These studies reveal that in our optimized thin films we are able to achieve FMR line widths as low as 1 G, comparable to the best thin-films of the Dzgold standarddz inorganic system yittrium iron garnet (YIG). These results are promising for the development of next generation all organic spintronic devices, but may in fact have an equal if not greater impact on established microwave frequency magnetoelectronics. When combined with our recent demonstration of encapsulation technologies that allow for device operation under ambient conditions, these results promise dramatic advances in our ability to construct topologically complex microwave devices and the ability to integrate magnetic functionality into existing flexible electronic architectures.

This talk is part of the Optoelectronics Group series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
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• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• MRC Building Seminar Room, Cavendish Laboratory, Department of Physics
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Optoelectronics Group
• School of Physical Sciences
• Thin Film Magnetic Talks
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