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Thickness-Dependent Gilbert Damping and Soft Magnetism in Metal/Co-Fe-B/Metal Sandwich Structure
Yimo Fan1, Jiawei Wang1,2, Aitian Chen3
1College of Science, Zhejiang University of Technology, Hangzhou 310023, China.
Nanomaterials (Basel, Switzerland)
|April 12, 2024
Summary
Achieving low damping in Cobalt-Iron-Boron (Co-Fe-B) films is key for efficient spintronic devices. This study reveals a non-monotonic damping trend with thickness, offering new insights for device optimization.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Low Gilbert damping is crucial for developing low-energy, high-speed spintronic devices.
- Cobalt-Iron-Boron (Co-Fe-B) alloys are promising candidates due to their compatibility with spintronic technologies.
Purpose of the Study:
- To investigate the thickness-dependent damping and soft magnetism in Co-Fe-B films.
- To develop a quantitative method for distinguishing intrinsic and extrinsic damping mechanisms.
Main Methods:
- Fabrication of Co-Fe-B films (up to 50 nm) sandwiched between non-magnetic layers.
- Ferromagnetic resonance (FMR) measurements to analyze thickness-dependent damping.
- Quantitative separation of intrinsic and extrinsic damping contributions.
Main Results:
- Observed a non-monotonic variation of damping with Co-Fe-B film thickness, contrasting previous reports.
- Minimum damping values and optimal thicknesses varied significantly with different non-magnetic capping layers.
- Demonstrated that structure selection influences the contributions of various damping mechanisms.
Conclusions:
- Thickness-dependent damping measurements provide an effective quantitative tool for analyzing damping mechanisms.
- Understanding these mechanisms is vital for optimizing Co-Fe-B films for spintronic applications.
- Findings pave the way for designing and improving low-damping spintronic devices.
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