Ferromagnetic nano-cross structures promise exotic static magnetic configurations and very rich and tunable magnetization dynamics leading towards potential applications in magnetic logic and communication devices. Here, we report an experimental study of external magnetic field tunable static magnetic configurations and magnetization dynamics in Ni80Fe20 nano-cross structures with varying arm lengths (L). Broadband ferromagnetic resonance measurements showed a strong variation in the number of spin-wave (SW) modes and mode frequencies (f) with bias field magnitude (H). Simulated static magnetic configurations and SW mode profiles explain the rich variation of the SW spectra, including mode softening, mode crossover, mode splitting, and mode merging. Such variation of SW spectra is further modified by the size of the nano-cross. Remarkably, with decreasing arm length of nano-cross structures, the onion magnetization ground state becomes more stable. Calculated magnetostatic field distributions support the above observations and revealed the non-collective nature of the dynamics in closely packed nano-cross structures. The latter is useful for their possible applications in magnetic storage and memory devices.
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28 January 2017
Research Article|
January 26 2017
Bias field tunable magnetic configuration and magnetization dynamics in Ni80Fe20 nano-cross structures with varying arm length
K. Adhikari
;
K. Adhikari
1Department of Condensed Matter Physics and Material Sciences,
S. N. Bose National Centre for Basic Sciences
, Block JD, Sector III, Salt Lake, Kolkata 700106, India
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S. Choudhury;
S. Choudhury
1Department of Condensed Matter Physics and Material Sciences,
S. N. Bose National Centre for Basic Sciences
, Block JD, Sector III, Salt Lake, Kolkata 700106, India
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R. Mandal;
R. Mandal
1Department of Condensed Matter Physics and Material Sciences,
S. N. Bose National Centre for Basic Sciences
, Block JD, Sector III, Salt Lake, Kolkata 700106, India
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S. Barman;
S. Barman
1Department of Condensed Matter Physics and Material Sciences,
S. N. Bose National Centre for Basic Sciences
, Block JD, Sector III, Salt Lake, Kolkata 700106, India
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Y. Otani
;
Y. 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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a)
Email: abarman@bose.res.in
J. Appl. Phys. 121, 043909 (2017)
Article history
Received:
October 01 2016
Accepted:
January 12 2017
Citation
K. Adhikari, S. Choudhury, R. Mandal, S. Barman, Y. Otani, A. Barman; Bias field tunable magnetic configuration and magnetization dynamics in Ni80Fe20 nano-cross structures with varying arm length. J. Appl. Phys. 28 January 2017; 121 (4): 043909. https://doi.org/10.1063/1.4974886
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