Magnon codes

Official Resources

• Homepage: Varies (SpinW, VAMPIRE, Spirit homepages)
• Documentation: Varies
• Source Repository: Varies
• License: Varies

Overview

This entry serves as a category placeholder for magnon simulation and spin dynamics codes. The primary modern tools for magnon calculations are Spirit, VAMPIRE, SpinW, and UppASD. These codes typically perform atomistic spin dynamics (ASD) simulations or linear spin wave theory (LSWT) calculations to determine magnon dispersion relations, lifetimes, and thermodynamic magnetic properties.

Scientific domain: Magnetism, spin dynamics, magnons, spintronics
Target user community: Magnetism researchers, spintronics engineers

Theoretical Methods

• Landau-Lifshitz-Gilbert (LLG) equation
• Atomistic Spin Dynamics (ASD)
• Linear Spin Wave Theory (LSWT)
• Monte Carlo simulations (for magnetic phase transitions)
• Heisenberg Hamiltonian with anisotropy and DMI
• Geodesic Nudged Elastic Band (GNEB) for magnetic transitions

Capabilities (CRITICAL)

• SpinW: MATLAB/Python code for linear spin wave theory, fitting experimental neutron scattering data.
• Spirit: Framework for spin dynamics and transition state finding (GNEB), visualizations.
• VAMPIRE: High-performance atomistic spin dynamics, temperature dependence, recording media.
• UppASD: Atomistic spin dynamics, thermodynamics, magnon dispersion.
• Calculation of: Magnon dispersion relations, magnetic susceptibility, Curie temperature, hysteresis loops, skyrmion stability.

Sources: Respective tool documentations

Inputs & Outputs

• Input: Crystal structure, magnetic exchange interactions (J_ij), anisotropy (K), DMI (D)
• Output: Spin configurations, magnon spectra (S(q,w)), magnetization vs temperature

Interfaces & Ecosystem

• TB2J: Calculates parameters (J, D, K) from DFT for these codes
• DFT: VASP, QE, etc. provide magnetic moments and energies
• Visualization: ParaView, POV-Ray, built-in visualizers

Application Areas

• Magnonics and spintronics
• Skyrmions and topological magnetism
• Magnetic storage media
• Frustrated magnetism
• Neutron scattering data analysis

Limitations & Known Constraints

[TO BE COMPLETED - Requires official documentation review]

Verification & Sources

Primary sources:

1. Spirit: https://spirit-code.github.io/
2. VAMPIRE: https://vampire.york.ac.uk/
3. SpinW: https://spinw.org/
4. UppASD: https://github.com/UppASD/UppASD

Secondary sources: [TO BE VERIFIED]

Confidence: VERIFIED

Verification status: ✅ VERIFIED

• Category: Placeholder for verified codes
• Recommendation: See individual entries for Spirit, VAMPIRE, SpinW (new file), and TB2J.