Spin configurations in nanostructured magnetic rings: From DC transport to GHz spectroscopy

J. Podbielski, F. Giesen, M. Berginski, N. Hoyer, D. Grundler

Research output: Contribution to journalConference articlepeer-review

32 Scopus citations

Abstract

We report three different experiments performed on permalloy nanorings. They address either (a) the stray-field and (b) the magnetoresistance characteristics of an individual nanoring, or (c) the magnetization dynamics of a periodic array of identical rings. Interestingly, in all three properties covering the frequency range from DC to 20 GHz we observe irreversible switching and hysteretic behavior. Localized spin waves, which are excited by ferromagnetic resonance in different ring segments, are found to obey an intriguing magnetic field dispersion. We attribute this to the characteristic spin configurations in the nanorings, i.e., the onion and the vortex states, which are controlled by the external magnetic field.

Original languageEnglish
Pages (from-to)341-348
Number of pages8
JournalSuperlattices and Microstructures
Volume37
Issue number5
DOIs
StatePublished - May 2005
Externally publishedYes
EventSpintronics: Spin Injection, Transport, and Manipulation - Bochum, Germany
Duration: 11 Oct 200412 Oct 2004

Keywords

  • Anisotropic magnetoresistance
  • Broadband ferromagnetic resonance
  • Ferromagnetic rings
  • Local Hall effect
  • Spin dynamics

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