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CEITECmagnonics / SpinWaveToolkit

Set of tools useful in spin wave research.
MIT License
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Complete Tacchi model in SWT #5

Closed GiovanniKl closed 4 months ago

GiovanniKl commented 4 months ago

The Tacchi model has severe underdocumentation so far. It would be best if someone (probably Ondra) could comment or directly add more comments to the Tacchi model functions.

I don't quite understand why there are always only certain quantization numbers. Could this be further perfected or this model be replaced by some other?

GiovanniKl commented 4 months ago

Now I noticed that in some version of SWT the calculation of DispersionCharacteristic.wU (circular frequency of magnetocrystalline OOP! anisotropy) was changed from Material's surface anistropy attribute Ku to Ku supplied in the __init__() constructor function. The Material attribute Ku then is no longer used.

Also in the Material class, the Ku was not specified before to be surface anisotropy, but I deduced from its usage long time ago. In the SWT_reformatted branch this is commented, but now I see that maybe quite obsolete. It would be good to decide how to handle the Material.Ku (delete/implement back in Tacchi) and mention in the Tacchi model description the original paper and that the used Ku is surface anisotropy constant.

I think the original paper is this: https://doi.org/10.1103/PhysRevB.100.104406 Please, correct me if I'm wrong.

OndrejW commented 4 months ago

The situation is bit more complicated (even bigger mess than you think :D ) The wU in Tacchi is indeed OOP anisotropy but the second Ku is IP anisotropy for SAFs. I will try to fix it.

OndrejW commented 4 months ago

Documentation done, plus I have added an example of use (it may be redone to Jupyter later)