Second Funding Period 2020-2023:

B02  Spin+Current: Diffusive spin currents and beyond

Prof. Dr. Mathias Kläui (Institute of Physics, JGU Mainz)
Prof. (apl.) Dr. Gerhard Jakob (Institute of Physics, JGU Mainz)

Project B02 will study spin transport from the conventional diffusive regimes to systems with dominating transport beyond pure diffusion, where the type of transport that can be coherent or possibly superfluidic or viscous. Using judiciously chosen systems we (i) study spin transport by selected magnons using magnon spectroscopy, (ii) study effects of magnon-phonon coupling, and (iii) design multilayers to explore confinement effects that govern the magnon properties. We then explore coherent spin transport, proposed spin superfluidity, and viscous magnon flows, and develop approaches to manipulate and control the spin transport in devices in these systems as a step to functionalizing spin transport.


First Funding Period 2016-2019:

B02  Spin+Current: Pure spin currents to manipulate magnetization

Prof. (apl.) Dr. Gerhard Jakob (Institute of Physics, JGU Mainz)
Prof. Dr. Mathias Kläui (Institute of Physics, JGU Mainz)
Dr. Robert Reeve (Institute of Physics, JGU Mainz)

Project B02 will explore pure spin currents, generated by selected methods and investigate their potential to efficiently manipulate magnetization. To this end the (i) generation, (ii) transport and (iii) absorption of the spin currents will be studied and optimized. Given different sources of spin current, the focus is then to optimize the spin current transport by using tailored spin conduits with optimized interfaces, geometries and materials and achieve strong spin current absorption by tailoring devices with low spin resistances and special spin structures. Ultimately the spin current will be functionalized and the spin-spin coupling employed to exert a spin transfer torque on magnetization. A comparison of numerical spin current drift and diffusion calculations with measured spin accumulations will be used to understand the underlying mechanisms.

Aim 1: Achieve efficient pure spin current injection into a non-magnetic conduit and compare with spin-currents from other sources;

Aim 2: Understand the processes which govern spin current transport, drift and relaxation in nanoscale conduits;

Aim 3: Achieve efficient manipulation of magnetization.

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