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Sci Rep. 2016 Jul 11;6:29702. doi: 10.1038/srep29702.

Domain wall pinning in FeCoCu bamboo-like nanowires.

Scientific reports

Eider Berganza, Cristina Bran, Miriam Jaafar, Manuel Vázquez, Agustina Asenjo

Affiliations

  1. Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, 28049, Spain.

PMID: 27406891 PMCID: PMC4942567 DOI: 10.1038/srep29702

Abstract

The three dimensional nature of cylindrical magnetic nanowires has opened a new way to control the domain configuration as well as the magnetization reversal process. The pinning effect of the periodic diameter modulations on the domain wall propagation in FeCoCu individual nanowires is determined by Magnetic Force Microscopy, MFM. A main bistable magnetic configuration is firstly concluded from MFM images characterized by the spin reversal between two nearly single domain states with opposite axial magnetization. Complementary micromagnetic simulations confirm a vortex mediated magnetization reversal process. A non-standard variable field MFM imaging procedure allows us to observe metastable magnetic states where the propagating domain wall is pinned at certain positions with enlarged diameter. Moreover, it is demonstrated that it is possible to control the position of the pinned domain walls by an external magnetic field.

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