Dynamic response of an artificial square spin ice
Artikel i vetenskaplig tidskrift, 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.

Författare

M. B. Jungfleisch

Argonne National Laboratory

W. Zhang

Argonne National Laboratory

Ezio Iacocca

Chalmers, Fysik, Teoretisk fysik

University of Colorado at Boulder

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

Argonne National Laboratory

Northwestern University

A. Hoffmann

Argonne National Laboratory

Physical Review B

2469-9950 (ISSN) 2469-9969 (eISSN)

Vol. 93 10

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.93.100401

Mer information

Senast uppdaterat

2023-08-08