Observation of Coherence and Partial Decoherence of Quantized Spin Waves in Nanoscaled Magnetic Ring Structures

H. Schultheiss, S. Schäfer, P. Candeloro, B. Leven, B. Hillebrands, and A. N. Slavin
Phys. Rev. Lett. 100, 047204 – Published 31 January 2008

Abstract

Experiments and simulations are reported, which demonstrate the influence of partial decoherence of spin-wave modes on the dynamics in small magnetic structures. Microfocus Brillouin light scattering spectroscopy was performed on 15 nm thick Ni81Fe19 rings with diameters from 1 to 3μm. For the so-called “onion” magnetization state several effects were identified. First, in the pole regions of the rings spin-wave wells are created due to the inhomogeneous internal field leading to spin-wave confinement. Second, in the regions in between, modes are observed which show a well pronounced quantization in radial direction but a transition from partial to full coherency in azimuthal direction as a function of decreasing ring size. In particular for larger rings a continuous frequency variation with position is observed which is well reproduced by spin-wave calculations and micromagnetic simulations.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 10 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.047204

©2008 American Physical Society

Authors & Affiliations

H. Schultheiss, S. Schäfer, P. Candeloro, B. Leven, and B. Hillebrands

  • Fachbereich Physik and Forschungsschwerpunkt MINAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany

A. N. Slavin

  • Department of Physics, Oakland University, Rochester, Michigan 48309, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 100, Iss. 4 — 1 February 2008

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×