Metastable states in magnetic nanorings

F. J. Castaño, C. A. Ross, Cathrine Frandsen, A. Eilez, D. Gill, H. I. Smith, M. Redjdal, F. B. Humphrey

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Abstract

Magnetization states and hysteresis behavior of small ferromagnetic rings, of diameters 180-520 nm, have been investigated using magnetic force microscopy. In addition to the expected bi-domain ("onion") and flux-closed ("vortex") magnetization states, a metastable state has been found. This "twisted" state contains a 360degrees domain wall which can exist over a wide range of applied fields. Four possible configurations of the twisted state are possible. Micromagnetic modeling shows that the twisted state is stabilised in small diameter, narrow rings. Additionally, more complex configurations such as double twisted states with two 360degrees walls have been observed.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume67
Issue number18
Pages (from-to)184425
ISSN0163-1829
DOIs
Publication statusPublished - 2003

Bibliographical note

Copyright (2003) American Physical Society

Keywords

  • MAGNETORESISTANCE
  • MEMORY
  • ELEMENTS
  • NARROW RINGS
  • MESOSCOPIC RING MAGNETS
  • ENDS

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