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PGI-1 Seminar: Dr. Amiclar Bedoya-Pinto 

Integrating molecules in spintronic devices: Spin-Valves, Magnetic Transistors and Functional Interfaces

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11.Dec.2013 11:30
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PGI-Hörsaal

CiC nanoGUNE, San Sebastian

Abstract:

Organic and carbon-based materials, characterized by long spin coherence times, are promising candidates for next-generation spintronic devices. They are not only being used as efficient templates for spin-polarized transport, but also as building blocks to tailor the energetics of hybrid organic-inorganic interfaces, due to the chemical and morphological flexibility offered by molecular functional groups. Moreover, the interaction between molecules and ferromagnetic surfaces leads to the formation of hybrid spin-polarized interface states, which are expected to play a key role in determining the interface magnetization and thus the spin-injection phenomena.

In this talk, I will focus on the experimental realization of three different applications that highlight the advantages of molecular materials: (i) as spin-transport channels, (ii) energy-level aligners and (iii) magnetic interface designers. As a first example, spin-polarized transport across C60 and Bathocuproine (BCP) molecules is demonstrated using spin-valve devices at room-temperature.  In the second example, the energy-level aligment at metal-C60 interfaces is determined with an-all electrical spectroscopy device called magnetic tunnel transistor.  Last but not least, I will present a non-conventional pathway towards the creation of magnetically active hybrid interfaces, which results from a strong chemical interaction between non-magnetic reactive metallic surfaces (e.g. Cu) and high-spin molecules (Tb3q9). The occurrence of a molecular-driven ferromagnetic phase at otherwise nonmagnetic metal surfaces highlights the importance of interfacial chemistry to tailor novel magnetic interfaces and functional hybrid structures for spintronic applications.

Contact

Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de

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