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Sunny

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Sunny.jl is a Julia package designed for modeling atomic-scale magnetism, enabling simulations of both equilibrium and non-equilibrium magnetic phenomena from microscopic models. It facilitates the calculation of dynamical spin structure factors, allowing for direct comparisons with experimental scattering data such as neutron or x-ray measurements.
It extends Landau-Lifshitz spin dynamics to treat spins as SU(N) coherent states, making it particularly effective for modeling materials with strong single-ion anisotropy. It provides robust Monte Carlo algorithms for sampling spin configuration in both equilibrium and non-equilibrium dynamics, making it possible to study a wide range of physical phenomena.

Information
Last Update:2025/07/25

Official site

https://github.com/SunnySuite/Sunny.jl/

License

MIT License

Availability

Linux PC + Julia compiler, Mac + Julia compiler, Windows + Julia compiler
Core Developers
  • Kipton Barros (Los Alamos National Laboratory)
  • David A. Dahlbom (Oak Ridge National Laboratory)
  • Cole Miles (Cornell University)
  • Cristian D. Batista (University of Tennessee)
Target substance/model

Quantum spin systems, Skyrmion crystals, Frustrated systems, real crystals
Physical quantities that can be computed

Dynamical structure factors, spin dynamics, spin configurations, interactive visualization of 3D crystals and magnetic structures
Methodology

Monto Carlo algorithm, Spin wave theory, Landau-Lifshitz dynamics
Parallelization

MPI/OpenMP hybrid parallelization is supported.
Document
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