Reconfigurable wave band structure of an artificial square ice

Iacocca, Ezio, Gliga, Sebastian, Stamps, Robert L. and Heinonen, Olle (2016) Reconfigurable wave band structure of an artificial square ice. Physical Review B, 93 (13). ISSN 2469-9950

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Official URL: http://dx.doi.org/10.1103/PhysRevB.93.134420

Abstract

Artificial square ices are structures composed of magnetic nanoelements arranged on the sites of a two-dimensional square lattice, such that there are four interacting magnetic elements at each vertex, leading to geometrical frustration. Using a semianalytical approach, we show that square ices exhibit a rich spin-wave band structure that is tunable both by external magnetic fields and the magnetization configuration of individual elements. Internal degrees of freedom can give rise to equilibrium states with bent magnetization at the element edges leading to characteristic excitations; in the presence of magnetostatic interactions these form separate bands analogous to impurity bands in semiconductors. Full-scale micromagnetic simulations corroborate our semianalytical approach. Our results show that artificial square ices can be viewed as reconfigurable and tunable magnonic crystals that can be used as metamaterials for spin-wave-based applications at the nanoscale.

Item Type: Article
Uncontrolled Keywords: magnons, spin waves, micromagnetic modeling, spin ice
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 30 Sep 2019 12:50
Last Modified: 11 Oct 2019 13:30
URI: http://nrl.northumbria.ac.uk/id/eprint/40921

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