B05  Spin+Coupling-Control: Control of spin-spin interactions in hybrid supramolecular systems

PD Dr. habil. Mirko Cinchetti (Department of Physics, TU Kaiserslautern)
Prof. Dr. Christiane Ziegler (Department of Physics, TU Kaiserslautern)
Dr. Stefan Lach (Department of Physics, TU Kaiserslautern)

Project B05 takes the fundamental knowledge of the spin phenomena in organic materials and ferromagnetic metals gained in Research Area A to the next level: from understanding to active tailoring. The main idea behind the project is to achieve active control over the spin-spin interactions in organic molecules and at their interfaces with ferromagnetic metals. To this end, we will design systems made of multiple molecular layers on top of a ferromagnetic substrate, and use light, doping and chemical engineering to translate the intrinsic electronic functionality of organic molecules into spin functionality of the whole stack. With this approach, we will achieve control of both the exchange interactions at hybrid ferromagnetic metal/organic interfaces as well as of the hyperfine interaction and spin-orbit coupling in molecular components. Using spin-, time-, and momentum-resolved photoemission methods we will determine the microscopic parameters that govern spin filtering and spin diffusion properties of the multi-layer hybrid systems, and the modification of such parameters under influence of the chosen external stimuli. Our approach will pave the way to a whole new class of advanced, i.e., actively controlled, spintronics devices based on tunable spin filtering and spin diffusion properties. Accordingly, we have defined two specific aims:

Aim 1: Realization of hybrid systems with tunable spin injection efficiency;

Aim 2: Realization of hybrid systems with tunable spin diffusion.

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