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Title: Width dependent transition of quantized spin-wave modes in Ni{sub 80}Fe{sub 20} square nanorings

We investigated optically induced ultrafast magnetization dynamics in square shaped Ni{sub 80}Fe{sub 20} nanorings with varying ring width. Rich spin-wave spectra are observed whose frequencies showed a strong dependence on the ring width. Micromagnetic simulations showed different types of spin-wave modes, which are quantized upto very high quantization number. In the case of widest ring, the spin-wave mode spectrum shows quantized modes along the applied field direction, which is similar to the mode spectrum of an antidot array. As the ring width decreases, additional quantization in the azimuthal direction appears causing mixed modes. In the narrowest ring, the spin-waves exhibit quantization solely in azimuthal direction. The different quantization is attributed to the variation in the internal field distribution for different ring width as obtained from micromagnetic analysis and supported by magnetic force microscopy.
Authors:
; ; ;  [1] ;  [2] ;  [2] ;  [3]
  1. Thematic Unit of Excellence on Nanodevice Technology, Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700098 (India)
  2. CEMS-RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  3. (Japan)
Publication Date:
OSTI Identifier:
22308169
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMIC FORCE MICROSCOPY; DISTRIBUTION; IRON ALLOYS; MAGNETIC FIELDS; MAGNETIZATION; NANOPARTICLES; NICKEL ALLOYS; QUANTIZATION; SIMULATION; SPECTRA; SPIN WAVES