Kolloquiumsvortrag: Prof. Markus Münzenberg / Uni Greifswald

24.11.2014 von 16:45 bis 18:15

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Hot spins and molecules: new ideas for a THz “green” information technology



Spinelectronics is exploiting the spin degree of freedom for novel information technology or devices. In my talk I will present future directions. These new ideas pave the way for low energy consumption, nanometer-scale building blocks for spin-based computing, and bridging timescales towards a THz spintronics. I will focus on two recent aspects of our research on organic materials for spinelectronic Devices and ultrafast excitation, accompanied by a fundamental introduction into the topic.

(i)    Molecules formed by the fusion of three benzene rings, belong to the class of open-shell systems and are Carbon based systems that carry a spin. A spin-filter device is formed at the interface to a ferromagnet with 20% magnetoresistance effect near room temperature, demonstrating the use of such molecules as templates to engineer organic spin-filter barriers and quantum registers storing a single spin.

 (ii)    New techniques for the detection of ultrafast spin-currents have to be developed to bring spin-based information technology to ultrafast time scales. The spin-current bunches launched from a ferromagnet can be converted to picosecond charge currents. They can be quantitatively determined via THz emission. The pulses can be shaped and manipulated in frequency. 

[1] T. Kampfrath, M. Battiato, P. Maldonado, G. Eilers, J. Nötzold, S. Mährlein, V. Zbarskyy, F. Freimuth, Y. Mokrousov, S. Blügel, M. Wolf, I. Radu, P. M. Oppeneer, M. Münzenberg, Terahertz spin current pulses controlled by magnetic heterostructures, Nature Nanotechnology 8, 256 (2013).

[2] K. V. Raman, A. M. Kamerbeek, A. Mukherjee, N. Atodiresei, T. K. Sen, P. Lazić, V. Caciuc, R. Michel, D. Stalke, S. K. Mandal, S. Blügel, M. Münzenberg, J. S. Moodera, Interface-engineered templates for molecular spin memory devices, Nature 493, 509 (2013).

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