Influence of Instabilities on High-Field Magnetic Domain Wall Velocity in (Co/Ni) Nanostrips

The field-driven velocity of magnetic domain walls in nanostrips patterned in (Co/Ni) multilayer films with perpendicular anisotropy is studied by magnetooptical microscopy. By applying fields up to 250 mT, two peculiar features are revealed, which are beyond the simple one-dimensional model. First,...

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Bibliographic Details
Published in:Applied physics express 2011-11, Vol.4 (11), p.113001-113001-3
Main Authors: Yamada, Keisuke, Jamet, Jean-Pierre, Nakatani, Yoshinobu, Mougin, Alexandra, Thiaville, André, Ono, Teruo, Ferré, Jacques
Format: Article
Language:English
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Summary:The field-driven velocity of magnetic domain walls in nanostrips patterned in (Co/Ni) multilayer films with perpendicular anisotropy is studied by magnetooptical microscopy. By applying fields up to 250 mT, two peculiar features are revealed, which are beyond the simple one-dimensional model. First, above wall depinning, a velocity plateau is observed over a 150 mT field range. Then, at large fields, an important increase of velocity occurs. Micromagnetic simulations reproduce this behaviour and underline the nontrivial role of wall structure deformations in the appearance of this complexity.
ISSN:1882-0778
1882-0786
DOI:10.1143/APEX.4.113001