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Manipulating Magnetic Damping of Fe/GeTe Heterostructures by Band Engineering.
Xu Yang1,2, Jia-Wan Li3, Yan Li1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 18, 2024
Summary
Researchers found that the Fermi level in Fe/GeTe heterostructures can tune magnetic damping. This tuning is linked to hybridized electronic bands, offering a new way to engineer magnetic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Magnetic damping is critical for magnetic heterostructures, but the role of subbands in hybridized bands is unknown.
- Band hybridization at interfaces can enhance magnetic damping, yet detailed contributions remain unexplored.
Purpose of the Study:
- To investigate how Fermi level modulation affects magnetic damping in Fe/GeTe heterostructures.
- To elucidate the relationship between hybridized band structures and magnetic damping.
- To explore band engineering as a method for controlling magnetic damping.
Main Methods:
- Utilized angle-resolved photoemission spectroscopy (ARPES).
- Employed density functional theory (DFT) calculations.
- Investigated Bi doping in Fe/GeTe heterostructures.
Main Results:
- Magnetic damping (αeff) was found to be tunable by the Fermi level in Bi-doped Fe/GeTe.
- Strong hybridization between Fe and GeTe surface Rashba bands enhances damping.
- Fermi level modifies the density of states (DOS) ratio, directly correlating with magnetic damping.
Conclusions:
- Provides a physical understanding of magnetic damping influenced by hybridized band structures.
- Demonstrates Fermi level control over magnetic damping via band structure modulation.
- Opens avenues for manipulating magnetic damping through band engineering in heterostructures.
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