Magnetic field driven dynamics in twisted bilayer artificial spin ice at superlattice angles

Begum Popy, R., Frank, J. and Stamps, R. L. (2022) Magnetic field driven dynamics in twisted bilayer artificial spin ice at superlattice angles. Journal of Applied Physics, 132(13), 133902. (doi: 10.1063/5.0118078)

Abstract

Geometrical designs of interacting nanomagnets have been studied extensively in the form of two-dimensional arrays called artificial spin ice. These systems are usually designed to create geometrical frustration and are of interest for the unusual and often surprising phenomena that can emerge. Advanced lithographic and element growth techniques have enabled the realization of complex designs that can involve elements arranged in three dimensions. Using numerical simulations employing the dumbbell approximation, we examine possible magnetic behaviors for bilayer artificial spin ice, in which the individual layers are rotated with respect to one another. The goal is to understand how magnetization dynamics are affected by long-range dipolar coupling that can be modified by varying the layer separation and layer alignment through rotation. We consider bilayers where the layers are both either square or pinwheel arrangements of islands. Magnetic reversal processes are studied and discussed in terms of domain and domain wall configurations of the magnetic islands. Unusual magnetic ordering is predicted for special angles that define lateral spin superlattices for the bilayer systems.

• Item Type: Articles
• Additional Information: This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery, John R. Leaders Fund—Canada Foundation for Innovation (CFI-JELF), Research Manitoba, and the University of Manitoba, Canada.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Stamps, Professor Robert

Creator Roles

Stamps, R. L.: Conceptualization, Project administration, Supervision

• Authors: Begum Popy, R., Frank, J., and Stamps, R. L.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Journal of Applied Physics
• Publisher: AIP Publishing
• ISSN: 1089-7550
• ISSN (Online): 1089-7550
• Published Online: 03 October 2022