We investigated optically induced ultrafast magnetization dynamics in square shaped Ni80Fe20 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.
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28 October 2014
Research Article|
October 30 2014
Width dependent transition of quantized spin-wave modes in Ni80Fe20 square nanorings
Chandrima Banerjee;
Chandrima Banerjee
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
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Susmita Saha;
Susmita Saha
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
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Saswati Barman;
Saswati Barman
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
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Olivier Rousseau;
Olivier Rousseau
2
CEMS-RIKEN
, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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YoshiChika Otani;
YoshiChika Otani
2
CEMS-RIKEN
, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3Institute for Solid State Physics,
University of Tokyo
, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Anjan Barman
Anjan Barman
a)
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
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a)
E-mail: abarman@bose.res.in
J. Appl. Phys. 116, 163912 (2014)
Article history
Received:
September 27 2014
Accepted:
October 17 2014
Citation
Chandrima Banerjee, Susmita Saha, Saswati Barman, Olivier Rousseau, YoshiChika Otani, Anjan Barman; Width dependent transition of quantized spin-wave modes in Ni80Fe20 square nanorings. J. Appl. Phys. 28 October 2014; 116 (16): 163912. https://doi.org/10.1063/1.4900616
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