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Updated: Aug 6, 2025
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
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Observation of large spin conversion anisotropy in bismuth
Naoki Fukumoto1, Ryo Ohshima1, Motomi Aoki1
1Department of Electronic Science and Engineering, Kyoto University, Kyoto, Kyoto 615-8510, Japan.
Summary
The effective g-factor
Area of Science:
- Condensed Matter Physics
- Spintronics
- Materials Science
Background:
- The effective g-factor's anisotropy, influenced by spin-orbit interaction (SOI), is crucial but challenging to determine from band structures in solids.
- Bismuth (Bi) exhibits significant effective g-factor anisotropy, particularly for holes at the T-point, with values near zero perpendicular to the trigonal axis and large along it.
Purpose of the Study:
- To investigate the relationship between the effective g-factor anisotropy and spin conversion anisotropy in bismuth.
- To experimentally and theoretically elucidate the spin conversion efficiency in different bismuth crystal orientations.
Main Methods:
- Spin-torque ferromagnetic resonance was employed to quantify spin conversion efficiency.
- Harmonic Hall measurements were utilized to corroborate the findings.
Main Results:
- A large spin conversion anisotropy was observed in bismuth, directly linked to the effective g-factor anisotropy.
- Rhombohedral (110) bismuth demonstrated a spin conversion efficiency of 17–27%, contrasting with negligible efficiency in Bi(111).
Conclusions:
- The study confirms that effective g-factor anisotropy is a key factor driving spin conversion anisotropy in materials like bismuth.
- This research highlights the importance of effective g-factor anisotropy in condensed-matter physics and opens avenues for novel spintronics applications controlled by g-factor properties.
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