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MA: Fachverband Magnetismus
MA 17: INNOMAG e.V. Diplom-/Master Prize 2019
MA 17.3: Talk
Tuesday, April 2, 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.