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High temperature stability in few atomic layer MoS2 based thin film heterostructures: structural, static and dynamic
Nanhe Kumar Gupta1, Amar Kumar1, Lalit Pandey1
1Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India. sujeetc@physics.iitd.ac.in.
Nanoscale
|July 20, 2023
Summary
Transition metal dichalcogenides like MoS2 show promise for spintronics. This study reveals MoS2 efficiently generates spin currents, demonstrating high thermal stability for magnetic memory applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Layered transition metal dichalcogenides (TMDs) are crucial for spintronic devices.
- The structural quality of TMDs and their interface with ferromagnetic (FM) layers significantly impacts device performance.
- Molybdenum disulfide (MoS2) is a widely studied TMD with potential spintronic applications.
Purpose of the Study:
- To investigate the spin-dynamic behavior in MoS2/CoFeB heterostructures.
- To analyze the effect of annealing on the structural, spin transport, and magnetic properties of these heterostructures.
- To establish MoS2 as an efficient spin current source for spintronic applications.
Main Methods:
- Fabrication of MoS2 (1-4 layers)/CoFeB (4-15 nm) heterostructures in as-grown and annealed states (400 °C).
- Characterization using Raman spectroscopy to analyze structural variations with layer number.
- Ferromagnetic Resonance (FMR) spectroscopy to study spin pumping and damping.
- Density Functional Theory (DFT) calculations to confirm spin-orbit coupling.
Main Results:
- Raman spectroscopy confirmed systematic variations in MoS2 layer separation with the number of layers.
- FMR revealed significant spin pumping from CoFeB to MoS2, evidenced by enhanced damping (∼49-51%).
- DFT calculations corroborated the high spin-orbit coupling in monolayer MoS2.
- Estimated spin current density in MoS2 increased with CoFeB thickness (∼0.3 to 0.7 MA m⁻²).
- Annealing at 400 °C did not significantly alter structural or spin transport properties, indicating high thermal stability.
Conclusions:
- MoS2/CoFeB heterostructures exhibit efficient spin pumping due to MoS2's strong spin-orbit coupling.
- The high thermal stability of these heterostructures makes them suitable for demanding applications.
- MoS2 serves as an effective spin current generator for spin-orbit torque-based magnetic memory devices.
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