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Microscopic theory of current-driven domain wall motion.

Gen Tatara¹, Hiroshi Kohno

¹PRESTO, JST and Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan. tatara@phys.metro-u.ac.jp

Journal of Electron Microscopy

|September 15, 2005

Summary

Domain wall motion in ferromagnetic nanowires is driven by electric current, with thick walls propelled by spin torque and thin walls by charge current pressure. Small-current operation for device integration is also discussed.

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Area of Science:

Condensed matter physics
Materials science
Nanotechnology

Background:

Domain walls in ferromagnetic nanowires are crucial for spintronic devices.
Understanding their dynamics under electric current is essential for device performance.

Purpose of the Study:

To theoretically investigate the dynamics of domain walls in ferromagnetic nanowires under electric current.
To elucidate the distinct driving mechanisms based on domain wall thickness.

Main Methods:

Theoretical study of domain wall dynamics.
Analysis of spin torque and charge current pressure effects.

Main Results:

Domain wall propulsion mechanism is dependent on wall thickness.

Related Experiment Videos

Thick walls (metallic wires) are driven by spin torque from current spin polarization.

Thin walls (nanocontacts, magnetic semiconductors) are driven by charge current pressure.

Conclusions:

The study clarifies the dual nature of domain wall driving mechanisms in ferromagnetic nanowires.
Identifies conditions for small-current operation, vital for practical device integration.