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Is Semiconducting Transition-Metal Dichalcogenide Suitable for Spin Pumping?
Bin Lu1,2, Yue Niu1, Qian Chen1
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China.
Nano Letters
|December 17, 2024
Summary
This study finds that semiconducting transition-metal dichalcogenides (TMDs) are unsuitable for spin pumping, contrary to previous reports. Experiments show no significant spin pumping effect at CoFeB/MoSe2 interfaces, suggesting extrinsic factors in prior research.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spin pumping is a phenomenon where spin current is generated at ferromagnetic material interfaces.
- Enhanced Gilbert damping in ferromagnetic metal/transition-metal dichalcogenide (TMD) interfaces has been attributed to spin pumping.
- The precise contribution of spin pumping versus extrinsic factors in these interfaces remains debated.
Purpose of the Study:
- To investigate the presence and magnitude of spin pumping at an atomically clean interface between a ferromagnetic metal (CoFeB) and a layered transition-metal dichalcogenide (MoSe2).
- To clarify whether observed damping enhancements in similar systems are due to intrinsic spin pumping or extrinsic experimental artifacts.
Main Methods:
- Fabrication of an atomically clean CoFeB/MoSe2 interface using an all-in-situ molecular beam epitaxy growth strategy.
- Utilizing ferromagnetic resonance (FMR) analysis to measure magnetodynamics and extract Gilbert damping parameters.
- Comparison of damping parameters between CoFeB/MoSe2 and control CoFeB/SiO2 interfaces.
Main Results:
- The Gilbert damping parameter of the CoFeB/MoSe2 interface was found to be similar to that of the CoFeB/SiO2 control interface.
- This similarity indicates the absence of a significant spin pumping effect at the CoFeB/MoSe2 interface.
- Similar results were observed for other representative interfaces, reinforcing the main finding.
Conclusions:
- Semiconducting transition-metal dichalcogenides (TMDs) are not suitable for efficient spin pumping.
- Observed damping enhancements in previous studies on ferromagnetic metal/TMD interfaces are likely dominated by extrinsic contributions.
- This work provides critical clarification on the mechanisms underlying damping in spintronic heterostructures.
Keywords:
ferromagnetic resonanceinterfacemolecular beam epitaxyspin pumpingtransition-metal dichalcogenideMore Related Videos
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