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Current-Induced Sliding Motion in a Helimagnet MnAu_{2}.
Yuta Kimoto1, Hidetoshi Masuda1, Takeshi Seki1,2
1Tohoku University, Institute for Materials Research, Sendai 980-8577, Japan.
Physical Review Letters
|February 21, 2025
Summary
Current-induced sliding motion was observed in helimagnetic manganese-gold (MnAu₂) thin films. This phenomenon, marked by changes in resistivity and voltage noise, suggests sliding of the helimagnetic structure.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Helimagnetic materials exhibit unique spin textures.
- Understanding current-driven dynamics in magnetic systems is crucial for novel device applications.
- Manganese-gold (MnAu₂) thin films are known for their helimagnetic properties.
Purpose of the Study:
- To investigate current-induced phenomena in helimagnetic MnAu₂ thin films.
- To determine if the helimagnetic structure itself can exhibit sliding motion.
- To differentiate the behavior in the helimagnetic state from the ferromagnetic state.
Main Methods:
- Fabrication of MnAu₂ thin films.
- Electrical transport measurements, including differential resistivity.
- Analysis of broadband voltage noise.
Main Results:
- An abrupt change in differential resistivity was observed at a threshold current in the helimagnetic state.
- This threshold behavior was absent in the induced ferromagnetic state.
- Broadband voltage noise emerged above the threshold current in the helimagnetic state.
Conclusions:
- The observed phenomena are attributed to current-induced sliding motion of the helimagnetic structure.
- The behavior is analogous to charge and spin density wave systems.
- This finding opens new avenues for exploring sliding dynamics in magnetic materials.
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