Remarkable enhancement of domain-wall velocity in magnetic nanostripes
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- Remarkable enhancement of domain-wall velocity in magnetic nanostripes
- Lee, Jun-Young; Lee, Ki-Suk; Kim, Sang-Koog
- ORTHORHOMBIC ANISOTROPY; MOTION; DYNAMICS; FILMS; NANOWIRES
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.91, no.12, pp.1 - 3
- Remarkable reductions in the velocity of magnetic-field (or electric current)-driven domain-wall (DW) motions in ferromagnetic nanostripes have typically been observed under magnetic fields stronger than the Walker threshold field [N. L. Schryer and L. R. Walker, J. Appl. Phys. 45, 5406 (1974)]. This velocity breakdown is known to be associated with an oscillatory dynamic transformation between transverse- and antivortex (or vortex)-type DWs during their propagations. The authors propose, as the result of numerical calculations, a simple means to suppress the velocity breakdown and rather enhance the DW velocities, using a magnetic underlayer of strong perpendicular magnetic anisotropy. This underlayer plays a crucial role in preventing the nucleation of antivortex (or vortex)-type DWs at the edges of nanostripes, in the process of periodic dynamic transformations from the transverse into antivortex- or vortex-type wall. The present study not only offers a promising means of the speedup of DW propagations to levels required for their technological application to ultrafast information-storage or logic devices, but also provides insight into its underlying mechanism.
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