Welcome to the magnetism group!
We are dedicated to cutting-edge research in the field of magnonics and related areas combined with excellent teaching.
Magnonics is a subfield of spintronics, which addresses the utilization of the spin degree of freedom for applications in information and communication technologies. We study „magnetic waves“, which are spin waves and their quanta called magnons, and we address new fundamental phenomena and their potential for applications. A particular focus is on macroscopic quantum phenomena such as supercurrents and their utilization, as well as on the development of magnonic devices for the information technology.
Our research is embedded in the Collaborative Research Center 173 „Spin+X“ funded by the Deutsche Forschungsgemeinschaft, as well as by several national, European and international projects. We offer opportunities for qualification in the frames of student assistantships, bachelor, master diploma and PhD projects in an international environment.
Best Poster Award
Our PhD student David Breitbach was awarded the poster prize at ESM 2021 (European School on Magnetism 2021) for his poster entitled ‘Amplification of Propagating Spin Waves by Stimulated Condensation’. The ESM is organized annually by the European Magnetism Association and was hosted this year in Cluj-Napoca, Romania, from September 6-17, 2021.
Our paper "Double accumulation and anisotropic transport of magnetoelastic bosons in yttrium iron garnet films" has been selected as a highlight in Physical Review B
The authors use the avoided crossing region created via magnetoelastic coupling between the magnonic and phononic dispersion in yttrium iron garnet films as a thermalization gateway for an artificially populated magnon gas. Magnons thermalizing through the hybridization region become hybrid quasiparticles that mix magnon and phonon properties. Due to the varying magnon-phonon interaction, they experience bottleneck accumulation near the bottom of the magnon spectrum, forming two quasiparticle groups with different propagation directions and velocity values.
Our review "Advances in coherent magnonics" has been published in Nature Reviews Materials
In this Review, we address specifically coherent spin waves. Coherency enables, for instance, the design of interference-based, wave processing spin-wave devices. We show that the field of magnonics is well suited for the implementation of wave-based computing devices, combining the excellent versatility, smallness, nonlinearity and external control it affords. Novel coherent states of matter, such as magnon Bose–Einstein condensates, enable a broad range of additional applications.
Wavevector-dependent magnon accumulation in parametrically populated magnon–phonon spectrum
P. Frey, V. I. Vasyuchka, B. Hillebrands, and A. A. Serga
J. Magn. Magn. Mater. 545, 168628 (2022)
Experimental observation of Josephson oscillations in a room-temperature Bose-Einstein magnon condensate
A. J. E. Kreil, H. Yu. Musiienko-Shmarova, P. Frey, A. Pomyalov, V. S. L'vov, G. A. Melkov, A. A. Serga, and B. Hillebrands
Phys. Rev. B 104, 144414 (2021)
Stabilization of a nonlinear magnonic bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by spin-orbit torque
M. Schneider, D. Breitbach, R. O. Serha, Q. Wang, M. Mohseni, A. A. Serga, A. N. Slavin, V. S. Tiberkevich, B. Heinz, T. Brächer, B. Lägel, C. Dubs, S. Knauer, O. V. Dobrovolskiy, P. Pirro, B. Hillebrands, and A. V. Chumak
Phys. Rev. B 104, L140405 (2021)