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Published on: July 31, 2015
Interface-induced spin Hall magnetoresistance enhancement in Pt-based tri-layer structure
Shun-Yu Huang1, Hong-Lin Li1, Cheong-Wei Chong2
1Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan.
Researchers studied spin Hall magnetoresistance (SMR) in platinum/nickel zinc ferrite (Pt/NZFO) structures. They achieved enhanced SMR ratios in tri-layer systems, suggesting potential for improved spintronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Spin Hall magnetoresistance (SMR) is a key phenomenon in spintronics for converting charge currents to spin currents.
- Nickel zinc ferrite (NZFO) is a promising material due to its high magnetization, suitable for SMR studies.
- Optimizing SMR in multilayer structures is crucial for developing advanced spintronic devices.
Purpose of the Study:
- To investigate the SMR behavior in bilayer (Pt/NZFO) and tri-layer (CoFe/Pt/NZFO) structures.
- To determine key SMR parameters like spin Hall angle and spin diffusion length.
- To explore methods for enhancing the SMR ratio through material engineering.
Main Methods:
- Fabrication of Pt/NZFO bilayer and CoFe/Pt/NZFO tri-layer structures using pulsed laser deposition.
- Angular-dependent magnetoresistance (MR) measurements to analyze SMR.
- Fitting experimental data to extract spin Hall angle and spin diffusion length.
- Comparison of SMR performance across different material compositions and layer thicknesses.
Main Results:
- Pt/NZFO bilayer structures exhibit well-defined SMR behavior.
- The spin Hall angle and spin diffusion length were determined to be 0.0648 and 1.31 nm, respectively.
- Pt/NZFO showed a higher MR ratio (0.135%) compared to Pt/YIG due to NZFO's higher magnetization.
- Tri-layer structures demonstrated SMR enhancement exceeding 70% compared to bilayer systems.
Conclusions:
- NZFO is a viable material for SMR studies, offering improved performance over YIG.
- The SMR ratio can be significantly enhanced by incorporating a CoFe layer in a tri-layer structure.
- Further investigation into spin current injection mechanisms is warranted for optimizing SMR devices.
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