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Co25Fe75 Thin Films with Ultralow Total Damping.
Eric R J Edwards1, Hans T Nembach1, Justin M Shaw1
1Quantum Electromagnetics Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305.
Cobalt-iron (CoFe) thin films exhibit ultralow damping parameters, crucial for spintronic devices. Researchers measured minimal damping and linewidth broadening, indicating high-quality magnetic materials for advanced applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Cobalt-iron (CoFe) alloys are vital for spintronic applications due to their magnetic properties.
- Controlling dynamic magnetic properties like damping is essential for device performance.
Purpose of the Study:
- To measure the dynamic magnetic properties of Co25Fe75 thin films.
- To investigate the influence of film thickness and seed layers on magnetic damping and linewidth.
- To characterize spin-wave dispersion in these films.
Main Methods:
- Direct current (dc) magnetron sputtering for film growth.
- Ferromagnetic resonance (FMR) spectroscopy to measure damping parameters.
- Wavevector-dependent Brillouin light scattering (BLS) spectroscopy for spin-wave characterization.
Main Results:
- Ultralow total damping parameters were achieved: < 0.0013 (out-of-plane) and < 0.0020 (in-plane).
- Low inhomogeneous linewidth broadening was observed, with a minimum FWHM linewidth of 1 mT at 10 GHz for a 12 nm film.
- Significant variation in in-plane linewidth behavior was noted with different seed layer combinations.
Conclusions:
- Co25Fe75 thin films possess excellent dynamic magnetic properties suitable for high-frequency spintronic applications.
- Seed layer engineering significantly impacts the magnetic linewidth behavior.
- The films exhibit well-defined spin-wave dispersion characteristics.
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