Making a Reconfigurable Artificial Crystal by Ordering Bistable Magnetic Nanowires
Spin-wave excitations (magnons) are investigated in a one-dimensional (1D) magnonic crystal fabricated out of Ni80Fe20 nanowires. We find two different magnon band structures depending on the magnetic ordering of neighboring wires, i.e., parallel and antiparallel alignment. At a zero in-plane magnetic field H the modes of the antiparallel case are close to those obtained by zone folding of the spin-wave dispersions of the parallel case. This is no longer true for nonzero H which opens a forbidden frequency gap at the Brillouin zone boundary. The 1D stop band gap scales with the external field, which generates a periodic potential for Bragg reflection of the magnons.
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Topp, J., Heitmann, D., Kostylev, M. P., & Grundler, D. (2010). Making a Reconfigurable Artificial Crystal by Ordering Bistable Magnetic Nanowires. Physical Review Letters, 104(20), Article 207205. https://doi.org/10.1103/PhysRevLett.104.207205
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2010
104
20
207205
REVIEWED
OTHER