Geometrically constrained magnetic wall

Details Geometrically constrained magnetic wall Geometrically constrained magnetic wall

1999-04-26

arxiv.org/abs/cond-mat/9904370v3

Phys. Rev. Lett. 83, pp. 2425-2428 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 4 pages, 4 eps figures; v2: revised version; v3: ref. added

Scientific paper

10.1103/PhysRevLett.83.2425

The structure and properties of a geometrically constrained magnetic wall in a constriction separating two wider regions are investigated theoretically. They are shown to differconsiderably from those of an unconstrained wall, so that the geometrically constrained magnetic wall truly constitutes a new kind of magnetic wall, besides the well known Bloch and Neel walls. In particular, the width of a constrained wall cann become very small if the characteristic length of the constriction is small, as is actually the case in an atomic point contact. This provides a simple, natural explanation for the large magnetoresistance observed in ferromagnetic atomic point contacts.

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