Domain walls in nano-thin permalloy films
| Autor: | M. Redjdal, F. B. Humphrey |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Permalloy
Thin layers Materials science Condensed matter physics business.industry Condensed Matter Physics Chirality (electromagnetism) Electronic Optical and Magnetic Materials Vortex Physics::Fluid Dynamics Condensed Matter::Materials Science Optics Condensed Matter::Superconductivity Magnet Nano Domain (ring theory) Thin film business |
| Zdroj: | physica status solidi (a). 201:1771-1776 |
| ISSN: | 1521-396X 0031-8965 |
| DOI: | 10.1002/pssa.200304541 |
| Popis: | Nano magnetic devices and current interest in nano-magnetism has motivated a new look at domain walls appropriate to such small sizes. Although the analytic expression for a Bloch wall in a soft magnetic material, such as Permalloy, was useful for large structures and thick films, understanding walls in thin layers as used in nano-devices is best served by computer simulation. An extensive study of walls in Permalloy like films as a function of film thickness has been made and will be discussed. For micron and sub-micron layers, it is clear that the static and dynamic shape of the wall is dominated by Neel caps at each surface and a vortex in the body of the film. These structures become the defining characteristic for thin films. The wall width, shape and extent are all manipulated by Neel caps and vortex extent. Wall mobility is sensitive to the shape, i.e., it depends upon whether the wall center is moving into the vortex or away. Wall chirality change, an Horizontal Bloch-like character, has been found in sub-micron films. In finite films, a blocking structure has been simulated based on vortex interaction with a film boundary and wall chirality change. |
| Databáze: | OpenAIRE |
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