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Domain wall behaviour at constrictions in ferromagnetic ring structures

✍ Scribed by M. Kläui; C.A.F. Vaz; W. Wernsdorfer; E. Bauer; S. Cherifi; S. Heun; A. Locatelli; G. Faini; E. Cambril; L.J. Heyderman; J.A.C. Bland

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
285 KB
Volume
343
Category
Article
ISSN
0921-4526

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✦ Synopsis

Direct non-intrusive imaging and magnetoresistance measurements have been employed to investigate the head-tohead domain walls occurring in micrometre-sized NiFe and Co rings. In wide rings vortex head-to-head domain walls are found to be present. These vortex head-to-head walls are repelled by constrictions in structures with notches, but they are pinned in energetically favourable positions adjacent to the notches. For rings with sufficiently large notches, a transverse head-to-head wall can be stabilized in the constriction. The type of domain wall is shown to be easily identifiable using magnetoresistance measurements.

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✍ Masahiro Hara; Takashi Kimura; Yoshichika Otani 📂 Article 📅 2008 🏛 Elsevier Science 🌐 English ⚖ 391 KB

We have investigated dynamics of paired domain walls in a microfabricated ferromagnetic ring by using a ballistic transport character of a two-dimensional electron gas (2DEG) microcross. The stray field from the domain walls results in a change in the bend resistance of the 2DEG cross lying beneath