SFB/TRR 173 SPIN+X

Second Funding Period 2020-2023:

B04  Spin+Magnon-Control: Macroscopic quantum state magnonics

Prof. Dr. Burkard Hillebrands (Department of Physics, TU Kaiserslautern)
Dr. habil. Oleksandr Serha (Department of Physics, TU Kaiserslautern)
Prof. Dr. Georg von Freymann (Department of Physics, TU Kaiserslautern)

Project B04 addresses the fundamental properties of magnon gases and Bose-Einstein condensates in dynamic magnetic media with a long-term perspective towards novel magnonic devices. Such media with time- and space-dependent characteristics open access to new artificially-stimulated physical effects in spin systems. In this project, optically induced dynamic thermal landscapes, developed in the first funding period, will be applied to propel and to control magnon supercurrents in magnetic films on mesoscopic and microscopic scales. Electric methods for the creation of fast varying magnetic potentials will be implemented on the way towards application oriented macroscopic quantum state magnonics.

 

First Funding Period 2016-2019:

B04  Spin+Magnon-Control: Dynamic control of magnon properties

Dr. Andrii Chumak (Department of Physics, TU Kaiserslautern)
Prof. Dr. Burkard Hillebrands (Department of Physics, TU Kaiserslautern)
Prof. Dr. Georg von Freymann (Department of Physics, TU Kaiserslautern)

In project B04 the realization, understanding and application of novel spin-wave phenomena in spatially variable and dynamic systems will be addressed. Dynamic magnonic media – especially those with properties varying on a time-scale faster than the propagation time of magnons – will be developed and will open access to control of magnon scattering and, thus, to artificially-stimulated new physical effects. Dynamic landscapes are induced by optical methods, namely illumination of the magnonic conduit with laser light in form of complex and nanosecond-fast dynamic spatial patterns. Patterns that are periodic in space, named magnonic crystals, are of special interest since the fast variation of the material’s properties in time enables a shift of the magnon frequency, while a spatially periodic modulation allows for a corresponding shift in the wave number. Thus, both the energy and the momentum of the magnons can be controlled by the dynamic magnonic crystal. This approach connects fundamental studies to the realization of potential applications. Two main aims will be addressed:

Aim 1: Development of dynamic spin-wave optics in out-of-plane magnetized magnetic films and realization of activated linear and nonlinear magnon scattering processes;

Aim 2: Realization of inelastic magnon scattering processes in dynamic magnonic crystals in the form of fast two-dimensional laser-induced magnetic patterns.

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