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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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Staggered dynamics in antiferromagnets by collective coordinates.
Erlend G Tveten1, Alireza Qaiumzadeh1, O A Tretiakov2
1Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Physical Review Letters
|August 29, 2014
Summary
We developed a simpler theory for antiferromagnetic dynamics using collective coordinates. Dissipative torques, not reactive ones, drive collective motion in these materials at low frequencies.
Area of Science:
- Condensed matter physics
- Spintronics
Background:
- Antiferromagnets offer potential for spin information storage and manipulation.
- The coupled dynamics of staggered fields and magnetization in antiferromagnets are highly complex.
Purpose of the Study:
- To present a simplified theoretical framework for describing staggered field dynamics in antiferromagnetic textures.
- To incorporate effects of dissipation, external magnetic fields, and current-induced torques.
Main Methods:
- Utilizing collective coordinates to model antiferromagnetic textures.
- Developing a theoretical approach to analyze the dynamics under various influences.
Main Results:
- The theory simplifies the complex coupled dynamics of antiferromagnets.
- Identified that dissipative torques, rather than reactive torques, are responsible for inducing collective motion at low frequencies and amplitudes.
- Modeled a one-dimensional domain wall as a driven harmonic oscillator.
Conclusions:
- The collective coordinate theory provides a more accessible understanding of antiferromagnetic dynamics.
- Current-induced torques primarily act dissipatively in driving collective motion.
- The behavior of specific antiferromagnetic textures can be analogized to driven harmonic oscillators.
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