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Current-Driven Dynamics of Magnetic Hopfions
X S Wang1, A Qaiumzadeh1, A Brataas1
1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Magnetic hopfions, 3D topological textures, can be excited in ferromagnetic materials. These novel magnetic structures offer potential for information technology due to their unique current-driven dynamics without Hall effects.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Topological magnetic textures exhibit unique properties relevant to information technology.
- Magnetic hopfions are 3D magnetization variations with a nontrivial Hopf index.
Purpose of the Study:
- Investigate the excitation and current-driven dynamics of Bloch-type and Néel-type hopfions.
- Explore the potential of hopfions as information carriers.
Main Methods:
- Theoretical investigation of hopfion dynamics in ferromagnetic materials.
- Analysis of spin-transfer torques (STTs) and spin-Hall torques (SHTs).
Main Results:
- Two types of hopfions (Bloch and Néel) are excited via Dzyaloshinskii-Moriya interactions.
- Hopfions possess a vanishing gyrovector, eliminating undesirable Hall effects.
- Néel-type hopfions move parallel to current via STT/SHT; Bloch-type hopfions move transverse (SHT) or parallel (STT).
Conclusions:
- Hopfions demonstrate distinct and controllable current-driven motion.
- The absence of Hall effects and controllable dynamics make hopfions promising for future information technologies.
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