Scientific Achievement
Control of collective ordering of an antiferromagnetic (AF) phase in nanopatterned dimer artificial spin ices.
Significance and Impact
Understanding the antiferromagnetic interactions provides insights into the physics of frustrated antiferromagnets and low-dimensional spin systems.
Research Details
- Artificial spin ice lattices were fabricated by patterning Permalloy nanomagnet dimers on a Kagome lattice using electron beam lithography.
- The magnetic state of individual nanomagnets and the inter-island coupling were visualized directly using LTEM, showing a geometry-dependent antiferromagnetic phase in the lattices.
- Using micromagnetic modeling, and Monte Carlo simulations based on a Hamiltonian dipolar model, we quantitatively understand the competing local interactions that govern the emergence of a short-range ordered AF state wherein the vertex magnetic charge is uniform.
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