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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Field-Driven Band Asymmetry and Nonreciprocal Transport in a Helimagnet
Darius-Alexandru Deaconu1, Aneesh Agarwal2, Rodion Vladimirovich Belosludov3
1The University of Manchester, Department of Physics and Astronomy, Oxford Road, Manchester M13 9PL, United Kingdom.
Physical Review Letters
|September 15, 2025
Summary
Helimagnets with helical spin structures show chiral properties. An external magnetic field induces band asymmetry, leading to nonreciprocal transport and potential spintronic applications.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Helimagnets possess noncollinear spin arrangements with helical modulation, resulting in emergent chiral properties.
- These materials are promising for spintronics, enabling robust data storage and topological spin textures like skyrmions.
Purpose of the Study:
- Investigate Yoshimori-type helimagnets, which stabilize helical spin structures via competing exchange interactions.
- Model the electronic structure of a 1D helimagnet under an external magnetic field to study nonreciprocal transport.
Main Methods:
- Developed a minimal model for the electronic structure of a 1D helimagnet.
- Analyzed the impact of an external magnetic field on the helical spin structure and electronic bands.
- Calculated electronic conductivity and photoconductivity in the presence of magnetic fields.
Main Results:
- Demonstrated the emergence of band asymmetry in the conical phase induced by an external magnetic field.
- Showcased a nonzero second-order electronic conductivity and injection photoconductivity due to this asymmetry.
- Established a link between real-space magnetic texture and electronic transport properties.
Conclusions:
- The study provides insights into chirality-driven transport phenomena in centrosymmetric helimagnets.
- Highlights the role of external magnetic fields in tuning electronic properties and enabling nonreciprocal transport.
- Suggests potential for developing novel spintronic devices based on helimagnetism.
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