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Structural Phase-Dependent Giant Interfacial Spin Transparency in W/CoFeB Thin-Film Heterostructures
Surya Narayan Panda1, Sudip Majumder1, Arpan Bhattacharyya1
1Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector-III, Salt Lake, Kolkata 700 106, India.
ACS Applied Materials & Interfaces
|April 22, 2021
Summary
Researchers achieved a giant interfacial spin transparency (T) of 0.81 in beta-tungsten/CoFeB heterostructures. This significant advancement in pure spin current generation is crucial for developing energy-efficient spintronic devices.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Pure spin current is vital for energy-efficient spintronics.
- Spin pumping is a key mechanism for generating pure spin current.
- High interfacial spin transparency (T) and spin-mixing conductance (Geff) are crucial for efficient spin pumping.
Purpose of the Study:
- To investigate the interfacial spin transparency (T) in beta-tungsten (β-W)/CoFeB heterostructures.
- To understand the relationship between the structural phase of tungsten and interfacial properties.
- To explore the potential for enhancing pure spin current generation.
Main Methods:
- Utilized time-resolved magneto-optical Kerr effect (TR-MOKE) technique.
- Fabricated substrate/W (t)/Co20Fe60B20 (d)/SiO2 (2 nm) thin-film heterostructures.
- Analyzed damping variations with W and CoFeB layer thicknesses to extract parameters.
Main Results:
- Achieved a giant interfacial spin transparency (T) of 0.81 ± 0.03 for the β-W/CoFeB interface.
- Observed significant variations in Geff and T correlated with W layer thickness and structural phase transitions.
- Confirmed spin pumping as the dominant effect on damping modulation.
Conclusions:
- The giant interfacial spin transparency in β-W/CoFeB heterostructures is a significant finding for spintronics.
- The strong dependence of T on W crystal structure highlights the importance of material phase control.
- These results pave the way for advanced spin-orbitronic devices utilizing pure spin currents.
Keywords:
Gilbert damping parameterinterfacial spin transparencyspin pumpingspin-mixing conductancethin-film heterostructurestime-resolved magneto-optical Kerr effectMore Related Videos
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