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Domain wall motion by the magnonic spin Seebeck effect
Physical Review Letters
|July 30, 2011
Summary
The spin Seebeck effect uses temperature gradients to create spin currents in magnetic materials. This research shows these currents can move domain walls, enabling new spin caloritronic devices.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Thermodynamics
Background:
- The spin Seebeck effect generates spin currents from temperature gradients in ferromagnets.
- This phenomenon links spin electronics with thermal properties, paving the way for spin caloritronics.
Purpose of the Study:
- Investigate the influence of temperature gradients on domain wall motion in ferromagnetic nanostructures.
- Explore the potential of spin caloritronic effects for manipulating magnetic domain structures.
Main Methods:
- Utilized spin model simulations.
- Employed an innovative, multiscale micromagnetic framework.
Main Results:
- Demonstrated that magnonic spin currents, driven by temperature gradients, induce spin transfer torque.
- Showcased the ability of these spin currents to drive domain wall motion towards hotter regions in ferromagnetic wires.
Conclusions:
- Magnonic spin currents offer a novel mechanism for domain wall manipulation.
- This work presents new possibilities for controlling magnetic domain structures using thermal gradients, advancing spin caloritronic device concepts.
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