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Updated: Oct 15, 2025

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Published on: June 28, 2018
Giant charge-to-spin conversion in ferromagnet via spin-orbit coupling
Yuki Hibino1, Tomohiro Taniguchi2, Kay Yakushiji2
1National Institute of Advanced Industrial Science and Technology (AIST), Research Center for Emerging Computing Technologies, Tsukuba, Ibaraki, 305-8568, Japan. y-hibino@aist.go.jp.
Researchers enhanced magnetic-dependent charge-to-spin conversion in ferromagnetic materials, overcoming geometrical restrictions for efficient magnetization manipulation without external fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spin Hall effect converts charge current to spin current for magnetization manipulation.
- Geometrical restrictions limit device applications, preventing perpendicular magnetization switching without external fields.
- Ferromagnetic materials offer time reversal asymmetry for magnetic-dependent charge-to-spin conversion, removing these restrictions.
Purpose of the Study:
- To achieve large enhancement of magnetic-dependent charge-to-spin conversion.
- To clarify the mechanism behind this enhanced conversion.
- To overcome geometrical restrictions in spintronic devices.
Main Methods:
- Investigated layer thickness dependence of conversion efficiency.
- Analyzed interfacial and bulk contributions to charge-to-spin conversion.
- Explored interfacial band engineering for control.
Main Results:
- Revealed coexistence of interfacial and bulk contributions to magnetic-dependent charge-to-spin conversion.
- Demonstrated that interfacial contribution is dominant and controllable.
- Achieved charge-to-spin conversion efficiency in ferromagnets an order of magnitude higher than in other materials.
Conclusions:
- Magnetic-dependent charge-to-spin conversion in ferromagnets is significantly enhanced through mechanism clarification.
- Interfacial engineering is key to controlling and optimizing this conversion process.
- This advancement removes geometrical restrictions, paving the way for advanced spintronic devices.
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