Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: INNOMAG e.V. Diplom-/Master Prize 2019

MA 17.3: Vortrag

Dienstag, 2. April 2019, 12:10–12:30, H48

Spin-Pumping and Spin Wave Damping in Co₂₅Fe₇₅ Thin-Film Heterostructures — •Luis Flacke — Walther-Meißner-Institut, Garching, Germany — Physics-Department, Technical University of Munich, Garching, Germany

Itinerant ferromagnets offer advantages in spintronic and magnonic devices, like e.g. compatibility with charge transport based technology. Typically they also suffer from drastically higher Gilbert damping than insulating ferrimagnets, which leads to an apparent trade-off. M. Schoen reported on "Ultra-low magnetic damping" in Co₂₅Fe₇₅ alloys [1], which could merge the two properties of low damping with the benefits of electrical conducting materials. During my master thesis I fabricated low-damping Co₂₅Fe₇₅-heterostructures by sputter deposition and separated Gilbert damping and spin pumping to the total damping using broadband ferromagnetic resonance spectroscopy. From the measurements, it was extrapolated that the intrinsic damping of the magnetic alloy reaches the low 10⁻⁴ regime. With Brillouin light scattering we confirmed low damping in structured Co₂₅Fe₇₅ by finding spin propagation length scales of more than 5.5 µm. The easy and fast fabrication process and its beneficial properties make Co₂₅Fe₇₅ a promising candidate for future, novel technologies in the field of spintronics.

[1] M. Schoen et al., Nat. Phys. 12, 839 (2016)
Financial support by Deutsche Forschungsgemeinschaft via projects WE5386/4 and WE5386/5 is gratefully acknowledged.