Spin wave standard problem » History » Revision 6
Revision 5 (Guru Venkat, 04/15/2013 10:42 AM) → Revision 6/23 (Guru Venkat, 04/15/2013 10:45 AM)
h1. Proposal for a Standard Micromagnetic Problem: Spin Wave Dispersion in a Magnonic Waveguide
G. Venkat, D. Kumar, M. Franchin, O. Dmytriiev, M. Mruczkiewicz, H. Fangohr, A. Barman, M. Krawczyk and A. Prabhakar
online: "journal":http://dx.doi.org/10.1109/TMAG.2012.2206820, local preprint pdf (attachment:SW_standard_problem_Pre_print.pdf)
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h2. Motivation
* The "micromagnetic standard problems":www.ctcms.nist.gov/~rdm/stdplan.html allow to compare the simulation results of different simulation tools and help finding bugs and errors.
* Here we propose a new standard problem that computes spin wave dispersion of a permalloy stripe using different micromagnetic packages
h2. Summary
* We propose a standard micromagnetic problem which involves a nanostripe of permalloy
* The magnetization dynamics is studied and methods to extract features from simulations are described. The image below shows spin waves propagating as a function space and time.
!SW_scaled.png!
* Spin wave dispersion curves, relating frequency and wave vector, are obtained for wave propagation in different configurations
* Simulation results obtained using both finite element (Nmag) and finite difference (OOMMF) packages are compared against analytic results
h2. Selected results
!Dispersions_scaled.png! !Dispersions_Guru.png!
# Supporting material
# **The mesh** - The mesh file (attachment:nanowire.nmesh.h5). It has been generated using the Examesh utility (attachment:examesh.zip) which can be used for generating the mesh for a cuboid structure.
# **The simulation script** - The simulation script (attachment:run.py) has details of the simulation. The comments in it should be self explanatory. Notice that it uses the HLib library for compressing the BEM matrix generated during the simulation
# **The post processing script** - The post processing script (attachment:post_process.py) generates the spin wave space-time and dispersion plots from the simulation data. It is assumed that NUmpy and matplotlib are both available.
# **The Makefile** - This Makefile (attachment:Makefile) should run the entire simulation and then generate the dispersion curves. We strongly suggest this sort of approach because it reduces manual effort and the chances of errors.
# **README** - A README file (attachment:README.txt) describes the action of the Makefile
All the files are included in this zip file (attachment:spin_wave_dispersion_standard_problem.zip)