SKM 2021 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation Prize 2021

SYSD 1: Presentations of the Finalists for the 2021 SKM Dissertation Prize

SYSD 1.5: Hauptvortrag

Montag, 27. September 2021, 11:50–12:15, Audimax 2

First Results on Atomically Resolved Spin-Wave Spectroscopy by TEM — •Benjamin Zingsem — Uni Duisburg

Spin-wave spectroscopy methods, such as electron-spin-resonance (ESR), and ferromagnetic resonance (FMR), are vital tools for materials characterization and chemical monitoring. Magnetic data storage, such as MRAM and hard-disk drives, but also magnetic materials for efficient and sustainable energy conversion in magnetic motors and turbines hinge on the precise knowledge of magnetic material parameters. These parameters can be extracted with the highest accuracy using FMR. On the other hand, ESR can determine the spin states of unpaired electrons in chemical compounds and during catalytic reactions, providing fundamental insight into the electron configuration. Together with momentum-sensitive techniques, such as Brillouin light scattering, both techniques are also central to spintronics experiments and the design of spintronic and magnonic devices. Here, we demonstrate a new technique to spatially resolve spin-resonances on the single nanometer scale with the potential for atomic resolution by transmission electron microscopy (TEM). The precessional torque of a spin excitation is coupled to a highly coherent electron beam, which reveals localized resonant spin excitations in transmission electron microscopy. This technique can be applied in-situ and in-operando on its own and together with conventional spectroscopy methods. As a model system, we present first results of magnonic networks comprising ferromagnetic nanoparticles and observe the spatial distributions of various spin-resonance modes.