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APS » Journals » Phys. Rev. B » Volume 69 » Issue 14
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Phys. Rev. B 69, 144421 (2004) [7 pages]

Magnetic configurations in 160–520-nm-diameter ferromagnetic rings

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F. J. Castaño, C. A. Ross*, A. Eilez†, W. Jung, and C. Frandsen‡
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Received 29 August 2003; revised 24 November 2003; published 21 April 2004

The remanent states and hysteretic behavior of thin-film magnetic rings has been investigated experimentally and by micromagnetic modeling. Rings of diameters 160–520 nm, made from Co using lift-off processing, show three distinct remanent states: a vortex state, an “onion” state with two head-on walls, and a “twisted” state containing a 360° wall. The range of stability of these states varies with ring geometry, with smaller width rings showing higher switching fields and greater variability.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.144421
DOI:
10.1103/PhysRevB.69.144421
PACS:
75.75.+a, 75.60.-d, 85.75.-d

*Electronic address: caross@mit.edu

†Present address: Departamento de Quimica-Fisica, Universidad del Pais Vasco, P.O. Box 644, 48080 Bilbao, Spain.

‡Permanent address: Department of Physics, Technical University of Denmark, Lyngby DK 2800, Denmark.

 
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