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Title: Tuning the band structures of a one-dimensional width-modulated magnonic crystal by a transverse magnetic field

Abstract

Theoretical studies, based on three independent techniques, of the band structure of a one-dimensional width-modulated magnonic crystal under a transverse magnetic field are reported. The band diagram is found to display distinct behaviors when the transverse field is either larger or smaller than a critical value. The widths and center positions of bandgaps exhibit unusual non-monotonic and large field-tunability through tilting the direction of magnetization. Some bandgaps can be dynamically switched on and off by simply tuning the strength of such a static field. Finally, the impact of the lowered symmetry of the magnetic ground state on the spin-wave excitation efficiency of an oscillating magnetic field is discussed. Our finding reveals that the magnetization direction plays an important role in tailoring magnonic band structures and hence in the design of dynamic spin-wave switches.

Authors:
; ; ;  [1]; ;  [2]
  1. Department of Physics, National University of Singapore, Singapore 117542 (Singapore)
  2. Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7 (Canada)
Publication Date:
OSTI Identifier:
22278143
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; ELECTRONIC STRUCTURE; ENERGY GAP; EXCITATION; GROUND STATES; MAGNETIC FIELDS; MAGNETIZATION; MAGNONS; ONE-DIMENSIONAL CALCULATIONS; SPIN WAVES

Citation Formats

Di, K., Lim, H. S., E-mail: phylimhs@nus.edu.sg, Zhang, V. L., Ng, S. C., Kuok, M. H., Nguyen, H. T., and Cottam, M. G. Tuning the band structures of a one-dimensional width-modulated magnonic crystal by a transverse magnetic field. United States: N. p., 2014. Web. doi:10.1063/1.4863776.
Di, K., Lim, H. S., E-mail: phylimhs@nus.edu.sg, Zhang, V. L., Ng, S. C., Kuok, M. H., Nguyen, H. T., & Cottam, M. G. Tuning the band structures of a one-dimensional width-modulated magnonic crystal by a transverse magnetic field. United States. https://doi.org/10.1063/1.4863776
Di, K., Lim, H. S., E-mail: phylimhs@nus.edu.sg, Zhang, V. L., Ng, S. C., Kuok, M. H., Nguyen, H. T., and Cottam, M. G. 2014. "Tuning the band structures of a one-dimensional width-modulated magnonic crystal by a transverse magnetic field". United States. https://doi.org/10.1063/1.4863776.
@article{osti_22278143,
title = {Tuning the band structures of a one-dimensional width-modulated magnonic crystal by a transverse magnetic field},
author = {Di, K. and Lim, H. S., E-mail: phylimhs@nus.edu.sg and Zhang, V. L. and Ng, S. C. and Kuok, M. H. and Nguyen, H. T. and Cottam, M. G.},
abstractNote = {Theoretical studies, based on three independent techniques, of the band structure of a one-dimensional width-modulated magnonic crystal under a transverse magnetic field are reported. The band diagram is found to display distinct behaviors when the transverse field is either larger or smaller than a critical value. The widths and center positions of bandgaps exhibit unusual non-monotonic and large field-tunability through tilting the direction of magnetization. Some bandgaps can be dynamically switched on and off by simply tuning the strength of such a static field. Finally, the impact of the lowered symmetry of the magnetic ground state on the spin-wave excitation efficiency of an oscillating magnetic field is discussed. Our finding reveals that the magnetization direction plays an important role in tailoring magnonic band structures and hence in the design of dynamic spin-wave switches.},
doi = {10.1063/1.4863776},
url = {https://www.osti.gov/biblio/22278143}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 115,
place = {United States},
year = {Fri Feb 07 00:00:00 EST 2014},
month = {Fri Feb 07 00:00:00 EST 2014}
}