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Spin-charge conversion in NiMnSb Heusler alloy films
Zhenchao Wen1,2,3, Zhiyong Qiu1,4, Sebastian Tölle5
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Science Advances
|December 20, 2019
Summary
Researchers explored spin-charge conversion in NiMnSb Heusler alloys. They observed a temperature-dependent charge signal, offering new ways to engineer spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Half-metallic Heusler alloys possess unique band structures ideal for spintronic applications.
- These materials exhibit high spin polarization and large magnetoresistance.
- Heusler alloys are promising for spin-charge conversion phenomena.
Purpose of the Study:
- Investigate spin-charge conversion in the prototypical Heusler alloy NiMnSb.
- Understand the factors influencing spin-charge conversion, including temperature, film thickness, and ordering structure.
Main Methods:
- Experimental characterization of NiMnSb films.
- Analysis of charge signal behavior with varying temperature and film parameters.
- Theoretical modeling to distinguish interfacial and bulk contributions.
Main Results:
- Observed an unusual charge signal with a sign change at low temperatures in NiMnSb.
- Demonstrated that film thickness and ordering structure can manipulate the spin-charge conversion effect.
- Identified two distinct contributions to spin-charge conversion: a temperature-independent interfacial contribution and a temperature-dependent bulk contribution.
Conclusions:
- Spin-charge conversion in NiMnSb is influenced by both interface and bulk properties.
- The bulk contribution is dominated by minority states and thermally excited magnons.
- Interface-bulk engineering offers a pathway for manipulating spin-charge conversion in ferromagnetic metals for spintronic devices.
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