University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Friday, October 20th 2017
12:20 pm:
Speaker: Timothy Peterson, University of Minnesota
Subject: Ferromagnetic resonance measurements of dynamic magnetization damping in Co(2)FeAl thin films in the ultra-low damping regime

Ferromagnetic resonance (FMR) linewidth measurements are used to study the magnetization damping constant of Heusler compound Co(2)FeAl. The FMR linewidth is found to be highly anisotropic and exhibit a nonlinear dependence on FMR frequency, contrary to simple expectations . A magnon-magnon scattering theory is used to explain the linewidth behavior, which reveals a ultra-low intrinsic damping constant of less than 10^-3. Prospects for further exploration of intrinsic damping processes based on these results are discussed.

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