Third Funding Period 2024-2027:
B02 Spin+Current: Angular momentum transport by magnons, spins, and orbits
Prof. (apl.) Dr. Gerhard Jakob (Institute of Physics, JGU)
Prof. Dr. Mathias Kläui (Institute of Physics, JGU)
Project B02 investigates angular momentum transport of selected material systems to understand key properties such as the transport length scales. This includes magnonic spin transport in antiferromagnets and spin transport in altermagnets, where in particular we want to demonstrate altermagnetic properties in oxidic systems. Based on our understanding of conventional magnonic spin transport, we will explore emergent quantum transport of correlated magnons that are intrinsically entangled in antiferromagnets. Beyond spin, we will probe orbital angular momentum transport, which is based on very different mechanisms. Using the understanding of the transport, the final aim will be to control transport by using hetero-structures such as YIG/GIG to demonstrate a magnon spin valve effect.
Second Funding Period 2020-2023:
B02 Spin+Current: Diffusive spin currents and beyond
Prof. (apl.) Dr. Gerhard Jakob (Institute of Physics, JGU)
Prof. Dr. Mathias Kläui (Institute of Physics, JGU)
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)
Prof. Dr. Mathias Kläui (Institute of Physics, JGU)
Dr. Robert Reeve (Institute of Physics, JGU)
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