Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 46.8: Vortrag

Mittwoch, 11. März 2026, 11:45–12:00, POT/0112

Signatures of magnon dispersion in spin transport — •Sebastian Sailler, Denise Reustlen, Michaela Lammel, Sebastian T. B. Goennenwein, and Richard Schlitz — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

The spin Hall magnetoresistance (SMR) provides electrical access to the magnetization of a magnetically ordered material. It recently became clear that changes in the net magnetization due to magnon creation and annihilation can be observed in the SMR. However, the number of magnons - and thus the magnetization - can also be modified by changing the energy of the system. In this work, we experimentally demonstrate that the changes of magnon occupation due to magnetic fields and crystal orientation sensitively modify the SMR response. Higher magnetic fields reduce the magnon population by pushing the magnon manifold to higher energies, leading to an increase of magnetization and thus the SMR. In turn, the influence of the anisotropic magnon gap in yttrium iron garnet films leads to a crystal orientation dependence of the SMR. The magnetic field and orientation dependence can be rationalized in terms of the changing magnon occupation. Our results showcase that magnetoresistive effects not only probe the properties of the static magnetization, but also reveal information about the dynamics, i.e., the magnons.

Keywords: Spin Hall Effect; Spin Hall Magnetoresistance; Magnetotransport; Magnonics