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Charge-spin interconversion in nitrogen sputtered Pt via extrinsic spin Hall effect.
Utkarsh Shashank1, Yu Kusaba1, Junnosuke Nakamura2
1Department of Physics and Information Technology, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820-8502, Japan.
By adding nitrogen to platinum, researchers enhanced the spin Hall effect (SHE) through extrinsic scattering. This study explores charge-spin interconversion and its reciprocal effects in modified platinum.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Charge-spin interconversion is crucial for spintronic devices.
- The spin Hall effect (SHE) plays a key role in converting charge currents into spin currents.
- Understanding factors influencing SHE efficiency is vital for device optimization.
Purpose of the Study:
- To investigate the effect of nitrogen (N) incorporation on platinum's (Pt) crystalline structure and SHE.
- To study the charge-spin interconversion and Onsager reciprocity of SHE in Pt with varying N content.
- To explore the role of extrinsic side-jump scattering in SHE enhancement.
Main Methods:
- Nitrogen gas flow rate varied from 0 to 20% during sputtering of Pt.
- Spin Hall effect (SHE) investigated using complementary methods: spin-torque ferromagnetic resonance and spin-pumping inverse SHE.
- Spin Hall efficiency (θSH) measured across a temperature range of 10–296 K.
Main Results:
- Nitrogen incorporation led to a reduction in the crystalline nature of platinum.
- Enhanced SHE was observed in nitrogen-doped platinum, attributed to extrinsic side-jump scattering.
- Reciprocal effects of charge-spin interconversion were successfully observed.
Conclusions:
- Incorporating nitrogen into platinum via sputtering enhances the spin Hall effect.
- Extrinsic scattering mechanisms are significant contributors to SHE enhancement in N-doped Pt.
- The study demonstrates the potential of N-doped Pt for improved spintronic applications.
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