Role of Bound Magnon in Magnetic Domain Wall Motion

Details Role of Bound Magnon in Magnetic Domain Wall Motion Role of Bound Magnon in Magnetic Domain Wall Motion

2009-01-20

arxiv.org/abs/0901.3066v1

Physics

Condensed Matter

Materials Science

4 pages

Scientific paper

We report on a quantum description of the domain wall (DW) motion under a spin current. A bound magnon, which is the zero mode of DW, is found to play a dominant role in DW dynamics. The bound magnon acquires its inertia by the hard axis anisotropy and is a free particle even under the spin current. The full transfer of spin angular momentum from the spin current to DW via the bound magnon leads to the DW motion with the adiabatic velocity, decoupling of spin waves from DW, and no Doppler shift in spin waves.

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