Dynamic response of an artificial square spin ice
Journal article, 2016
Magnetization dynamics in an artificial square spin-ice lattice made of Ni80Fe20 with magnetic field applied in the lattice plane is investigated by broadband ferromagnetic resonance spectroscopy. The experimentally observed dispersion shows a rich spectrum of modes corresponding to different magnetization states. These magnetization states are determined by exchange and dipolar interaction between individual islands, as is confirmed by a semianalytical model. In the low field regime below 400 Oe a hysteretic behavior in the mode spectrum is found. Micromagnetic simulations reveal that the origin of the observed spectra is due to the initialization of different magnetization states of individual nanomagnets. Our results indicate that it might be possible to determine the spin-ice state by resonance experiments and are a first step towards the understanding of artificial geometrically frustrated magnetic systems in the high-frequency regime.
Author
M. B. Jungfleisch
Argonne National Laboratory
W. Zhang
Argonne National Laboratory
Ezio Iacocca
University of Colorado
Chalmers, Physics, Theoretical Physics
J. Sklenar
Argonne National Laboratory
J. Ding
Argonne National Laboratory
W. Jiang
Argonne National Laboratory
S. Zhang
Argonne National Laboratory
J. E. Pearson
Argonne National Laboratory
V. Novosad
Argonne National Laboratory
J. B. Ketterson
Northwestern University
O. Heinonen
Northwestern University
Argonne National Laboratory
A. Hoffmann
Argonne National Laboratory
Physical Review B
2469-9950 (ISSN) 2469-9969 (eISSN)
Vol. 93 10Subject Categories (SSIF 2011)
Condensed Matter Physics
DOI
10.1103/PhysRevB.93.100401