TY - JOUR
T1 - Anisotropic spin-wave dispersion in two-dimensional Ni80Fe20 diatomic nanodot array
AU - De, Anulekha
AU - Banerjee, Chandrima
AU - Kumar Chaurasiya, Avinash
AU - Mandal, Ruma
AU - Otani, Yoshichika
AU - Kumar Mitra, Rajib
AU - Barman, Anjan
N1 - Funding Information:
The authors gratefully acknowledge the financial support from S. N. Bose National Centre for Basic Sciences (grant no. SNB/AB/18-19/211) and the Department of Science and Technology , Government of India (grant No. SR/NM/NS-09/2011 (G)). AD, and AKC acknowledge DST, Govt. of India for INSPIRE Fellowship. CB acknowledges CSIR, Government of India, for the senior research fellowship.
Funding Information:
The authors gratefully acknowledge the financial support from S. N. Bose National Centre for Basic Sciences (grant no. SNB/AB/18-19/211) and the Department of Science and Technology, Government of India (grant No. SR/NM/NS-09/2011(G)). AD, and AKC acknowledge DST, Govt. of India for INSPIRE Fellowship. CB acknowledges CSIR, Government of India, for the senior research fellowship.
Publisher Copyright:
© 2019
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Artificially patterned magnonic crystals serve as a promising candidate for the emerging research fields of magnonics and spintronics. Here, we investigate the spin-wave dispersion in a diatomic nanodot lattice made of Ni80Fe20 nanodots of two different diameters placed in close proximity to form a binary magnonic crystal with a complex double-dot unit cell. The frequency dispersion of SW eigenmodes experimentally measured by the Brillouin light-scattering technique is in good agreement with the numerically calculated band structure derived from the linearized Landau-Lifshitz equation. Due to the change of the nature of interaction among the dots in two mutually perpendicular orientation of the applied bias magnetic field, magnonic band structure, including the slope of the dispersion curves, varies significantly. The anisotropic SW propagation is also studied numerically by local excitation of spin-wave dynamics in this system. This phenomenon is further explained by the calculated iso-frequency contours. Efficient manipulation of spin waves in this new type of two-dimensional magnonic crystal is promising for the development of nanoscale magnonic and spintronic devices.
AB - Artificially patterned magnonic crystals serve as a promising candidate for the emerging research fields of magnonics and spintronics. Here, we investigate the spin-wave dispersion in a diatomic nanodot lattice made of Ni80Fe20 nanodots of two different diameters placed in close proximity to form a binary magnonic crystal with a complex double-dot unit cell. The frequency dispersion of SW eigenmodes experimentally measured by the Brillouin light-scattering technique is in good agreement with the numerically calculated band structure derived from the linearized Landau-Lifshitz equation. Due to the change of the nature of interaction among the dots in two mutually perpendicular orientation of the applied bias magnetic field, magnonic band structure, including the slope of the dispersion curves, varies significantly. The anisotropic SW propagation is also studied numerically by local excitation of spin-wave dynamics in this system. This phenomenon is further explained by the calculated iso-frequency contours. Efficient manipulation of spin waves in this new type of two-dimensional magnonic crystal is promising for the development of nanoscale magnonic and spintronic devices.
KW - Brillouin light scattering (BLS)
KW - Diatomic nanodot array
KW - Iso-frequency contours
KW - Magnonic band structure
KW - Micromagnetic simulations
KW - Plane wave method (PWM)
KW - Spin-wave dispersion
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U2 - 10.1016/j.jmmm.2019.165557
DO - 10.1016/j.jmmm.2019.165557
M3 - Article
AN - SCOPUS:85069212668
VL - 491
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
M1 - 165557
ER -