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Spin wave standard problem » History » Revision 5

Revision 4 (Guru Venkat, 04/15/2013 10:17 AM) → Revision 5/23 (Guru Venkat, 04/15/2013 10:42 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) 

 {{toc}} 

 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. described 
 !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_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) 
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