Projects per year
We report on broadband ferromagnetic resonance linewidth measurements performed on epitaxial Heusler thin films. A large and anisotropic two-magnon scattering linewidth broadening is observed for measurements with the magnetization lying in the film plane, while linewidth measurements with the magnetization saturated perpendicular to the sample plane reveal low Gilbert damping constants of (1.5±0.1)×10-3, (1.8±0.2)×10-3, and <8×10-4 for Co2MnSi/MgO, Co2MnAl/MgO, and Co2FeAl/MgO, respectively. The in-plane measurements are fit to a model combining Gilbert and two-magnon scattering contributions to the linewidth, revealing a characteristic disorder length scale of 10-100 nm.
Bibliographical noteFunding Information:
This work was supported by NSF under Grant No. DMR-1708287 and by SMART, a center funded by nCORE, a Semiconductor Research Corporation program sponsored by NIST. The sample growth was supported by the DOE under Grant No. DE-SC0014388 and the development of the growth process by the Vannevar Bush Faculty Fellowship (ONR Grant No. N00014-15-1-2845). Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program.
© 2020 American Physical Society.
How much support was provided by MRSEC?
Reporting period for MRSEC
- Period 7