Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: INNOMAG e.V. Dissertationspreis 2019 / Ph.D. Thesis Prize

MA 14.4: Vortrag

Dienstag, 2. April 2019, 11:00–11:30, H48

Making Magnonic Spin Currents useful - propagation, manipulation and detection — •Joel Cramer — Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany — Graduate School of Excellence Materials Science in Mainz, Mainz, Germany

Magnon-based spintronic applications enable a promising alternative to charge-driven devices for information transport and processing [1]. I discuss different key aspects of magnon spintronics necessary to functionalize such spin currents. First, the efficient interconversion of spin and charge information by the (inverse) spin Hall effect in the binary alloy Cu_1−xIr_x [2] is demonstrated. In this material, the spin Hall effect exhibits a complex composition dependence with a maximum spin Hall angle near 40% Ir content. I will further compare and show that DC and THz spin currents exhibit similar behavior, revealing the functionality of spin-charge conversion up to THz speeds. Regarding magnon logic as a key feature of magnon spintronics, the spin-dependent (inverse) spin Hall effect in metallic ferromagnets like Co or Co₆₀Fe₂₀B₂₀ is demonstrated. In ferromagnetic resonance spin pumping [3] and non-local spin transport [4] measurements, it is shown that the spin detection efficiency strongly depends on the angle between that ferromagnet’s magnetization and the spin current polarization. The distinct properties of spin-up and spin-down electrons in the ferromagnet allow one to implement a spin valve like effect using magnon detection with an amplitude of up to 120%. [1] Chumak et al., Nat. Phys. 11, 453 (2015) [2] Cramer et al., Nano Lett. 18, 1064-1069 (2018) [3] Cramer et al., Nat. Commun. 9, 1089 (2018) [4] Cramer et al., arXiv:1810.01227 (2018)